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Plain-English explanations of DNS records, email security protocols, and competitive SaaS infrastructure concepts.
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DNS & Network
(73)Google Fonts: Where Your Website's Typography Comes From
Google Fonts is a free library of web fonts served from Google's CDN. Learn why your site might be loading fonts from fonts.googleapis.…
hCaptcha: A Privacy-Friendly Bot Check for Your Site
hCaptcha is a privacy-focused CAPTCHA that blocks bots while respecting user data. Learn how it works, why it matters, and what to do when it fails.
OneTrust: Managing Cookie Consent and Data Privacy on Your Site
OneTrust is a tool that helps websites comply with privacy laws like GDPR and CCPA by handling cookie consent banners and data governance.…
Customer.io: What It Is and Why It’s Showing in Your DNS
Your domain scan flagged Customer.io — an automated messaging platform. Learn what it does, how DNS records tie into it, and how to keep your emails delivering.
SendGrid: Why It's in Your DNS and What It Does for Your Email
SendGrid is a Twilio email delivery platform used for marketing and transactional emails. If TechSpy shows SendGrid in your DNS, this explains why it's …
What Is VWO and Why Is Its Script on Your Website?
Found VWO script on your domain? Learn what Visual Website Optimizer does, how A/B testing and heatmaps work, and why it matters for your site's conversion …
Optimizely: A/B Testing and Personalization, Explained
Optimizely is a digital experience platform for A/B testing and personalization. Discover how it works, why it matters for your business, and why your …
What Is WooCommerce? Your Online Store on WordPress
WooCommerce turns a WordPress site into a full online store. Learn how it works, what a TechSpy scan flags, and why your domain's DNS setup can make or …
What Is Shopify? (And Why It's Powering Your Store)
Shopify runs your online store, connecting to your domain through DNS records. A correct setup ensures seamless checkout, secure payments, and reliable …
Nginx: The Software That Delivers Your Website to Visitors
Nginx is the web server that hands your website to anyone who asks. A poor setup can make your site slow or crash during traffic spikes.…
Tailwind CSS: Styling Your Website with Lego-Like Building Blocks
Tailwind CSS is a utility-first framework that lets developers style websites using pre-built classes. Learn what it does and why your site might be using it.
Salesforce Explained: Why Your Scan Found This CRM Giant
Salesforce is a CRM platform that can send email from your domain. A TechSpy scan detects it via SPF records and website scripts.…
HubSpot: What Your TechSpy Scan is Telling You
HubSpot is the CRM and marketing platform that sends emails from your domain. Here's why it needs your SPF, DKIM, and CNAME — and how to set them up so your …
Auth0: Who Handles Your Customer Logins (And Why It Matters)
Auth0 manages logins for your website or app. If TechSpy detects it, your domain uses a third-party authentication platform—here's what that means and how …
Why PayPal Shows Up in Your Domain’s DNS (and What to Do About It)
When TechSpy flags PayPal in your DNS, it means your domain is set up for secure payments. Learn what those records do and how to keep them safe.
Stripe: What That Payment Button on Your Site Actually Does
Stripe processes online payments without storing card data. Discover why it shows up in your domain scan and how to verify your ownership.
What Is Datadog? Explaining That Mysterious DNS Entry
Your TechSpy scan found Datadog linked to your domain. Understand what Datadog is, how it ended up in your DNS, and what to do about it.
What Is Sentry? The Error Tracker That Helps Developers Fix Bugs Faster
Sentry is a tool developers use to catch software bugs in real time. Here’s why your website might have it, how it works, and what to do if TechSpy flags it.
What Is Zendesk? The Chat Widget on Your Site
Zendesk is a customer service platform that powers chat widgets and help centers. TechSpy detected it on your site—here's what that means and how it works.
What Is Intercom? Explaining the Chat Widget on Your Website
Intercom is a customer messaging platform that adds live chat, bots, and tours to your website. Discover what it does and why your TechSpy scan flagged it.
LinkedIn Insight Tag: What It Tracks and Why It Matters
The LinkedIn Insight Tag is a small code snippet that tracks website visitors, enabling B2B retargeting and campaign measurement.…
Meta Pixel: How Facebook Tracks Clicks and Conversions
Meta Pixel is a snippet of code that measures ad performance, builds audiences, and retargets visitors on Facebook & Instagram.…
Webflow and Your Domain: Why Email Still Needs Attention
Your site runs on Webflow, but does your email? Learn why a beautiful website doesn't guarantee email deliverability, and how to fix missing SPF, DKIM, and …
WordPress Explained: The Platform That Runs Your Website
WordPress is the open-source software behind 40% of all websites. Learn how it works, why your domain scan flagged it, and what to do if it's exposed.
Why Your Domain Is Using Cloudflare (And When to Worry)
Cloudflare is a service that makes your website faster and safer. But if your TechSpy scan flagged it, here's what that means for your email and site—and …
Vercel: What It Is and Why Your Domain Points to It
Vercel hosts websites and apps, especially Next.js. If your domain scan flagged a Vercel CNAME, learn what that means for your DNS and site reliability.
Segment: One Snippet to Rule Your Marketing Data
Segment is a tool that collects customer data from your website and apps, then sends it to every analytics and marketing tool you use. Here's why that matters.
Google Analytics: Know Who Visits Your Site and What They Do
Google Analytics (GA4) shows who comes to your website, what they click, and if they buy. Learn how it works in plain English—no technical jargon.
Next.js Explained: Instant Websites Without the Tech Overhead
Next.js is a React framework that pre-builds pages on a server, so your site loads instantly, boosts SEO, and keeps visitors engaged—even for non-technical …
React: That Warning About Your Site’s Framework, Explained
React is the JavaScript library that powers interactive parts of your site. Understand what it means when a scan flags it, and how to handle the warning …
Web Fonts: How Custom Typography Affects Your Site's Speed and Brand
Web fonts power custom typography on your site, but they can slow page loads. Understand Google Fonts, Adobe Fonts, and how to keep design fast and …
Security & Compliance Tools: What They Signal About Trust
Learn how OneTrust, hCaptcha, and Cloudflare Bot Management are detected and what they reveal about a company's investment in privacy, security, and …
Email Delivery Tools: SendGrid, Customer.io, Iterable Explained
Learn how email delivery tools like SendGrid, Customer.io, and Iterable help businesses send marketing emails reliably, and how they differ from email security.
What Your E-commerce Platform Reveals About Your Business
Learn what e-commerce platforms like Shopify and Magento do, how TechSpy detects them via DNS, and what your choice says about your company’s commerce maturity.
Web Servers Explained: Nginx, Apache, LiteSpeed, and What They Mean
Discover what a web server like Nginx or Apache actually does, how TechSpy detects it, and why your choice affects site speed and security.
UI Libraries: The Building Blocks of Your Website's Look
UI libraries like Tailwind, Bootstrap, and MUI give teams a shared design vocabulary. Learn how they work, how TechSpy detects them, and what your stack …
What CRM and Marketing Automation Tools Reveal About a Business
HubSpot, Salesforce, Mailchimp, and others power email outreach. Discover how they’re spotted in a DNS scan and what that says about a company’s revenue engine.
What Authentication Services (Like Auth0) Do for Your App
Authentication services like Auth0, Clerk, Okta, Firebase Auth, and Supabase Auth handle user logins securely, protecting your app and customer data.…
What a Payment Provider Tells You About How a Business Makes Money
Learn how Stripe, PayPal, Paddle, and other payment providers work, how TechSpy detects them, and what they reveal about a company's revenue strategy and …
Monitoring Tools: What Sentry and Datadog Say About Maturity
Monitoring and APM tools like Sentry track errors and performance. Here's what TechSpy's detection of these tools reveals about your engineering maturity.
Chat & Support DNS Records: What They Are and Why They Matter
TechSpy found an Intercom or Zendesk record in your DNS? Learn what these chat tool records mean, how they signal customer experience investment, and how to …
Advertising Pixels: What They Reveal About Ad Spend and GTM Strategy
What Meta Pixel, LinkedIn Insight Tag, TikTok Pixel, and Google Ads tags do—and how detecting them reveals ad spend and GTM strategy.
What Is a CMS? Understanding Your Website's Engine
A content management system (CMS) powers your website, letting you update pages without coding. Learn how TechSpy detects yours, and why platform choice …
Where Your Website Lives: Hosting and CDN, Explained
Your site's speed and reliability depend on its hosting and whether you use a CDN. Learn what hosting providers and CDNs do, how they're detected, and why …
Why Your Website's Framework Matters (Even If You're Not a Developer)
A web framework is the hidden foundation of your site. Learn what React, Next.js, Vue, and others mean for your business, and how TechSpy detects them.
Scan Stages: From Basic Checks to Full Security Review
TechSpy's multi-stage scan uncovers everything from uptime to email spoofing. Learn what each stage means, why skipping one leaves you exposed, and how to …
Force HTTPS & Redirect to WWW: What It Is and Why It Matters
Learn why redirecting visitors to the secure, www version of your site protects data, boosts trust, and helps search engines—even if you're not technical.
Subdomain Takeover: The Hidden Danger of Forgotten DNS Records
A subdomain takeover happens when an attacker claims an abandoned service your subdomain points to, using your trusted domain to host malicious content.…
Wildcard SSL: One Certificate for All Your Subdomains
A wildcard SSL secures your domain and all subdomains at once. Understand how it works, the security risks, and what to do if TechSpy flagged it.
DNS Propagation & TTL: Why Your Domain Changes Take Time
Discover why DNS updates for email or website changes aren't instant, what TTL means, and how to handle propagation delays in plain English.
What Is an XML Sitemap? Helping Search Engines Find Every Page
An XML sitemap helps search engines discover and index your website pages. Learn what it is, why it matters for SEO, and how TechSpy detects it.
What Are Subdomains? A Simple Guide to Using app, blog, and More
Subdomains organize your digital presence into marketing, app, docs, and API layers. Learn how they work and what they reveal about company infrastructure.
MX Records: Where Your Incoming Email Actually Goes
MX records tell the world where to deliver email for your domain. If they're wrong, your inbox stays empty. Learn how they work and how to fix common issues.
MX, SPF, DKIM, DMARC: Your Email’s Delivery and Security Foundation
Understand how MX, SPF, DKIM, and DMARC work together to get your emails delivered, protect your domain from fraud, and keep your business communications …
HTTP vs HTTPS: Why That ‘S’ Is Crucial for Your Website
Learn the difference between HTTP and HTTPS, why the 'S' is crucial for trust, SEO, and security, and how to fix common web reachability issues that TechSpy …
DNS Resolver Analysis: Does Your Domain Look the Same Worldwide?
DNS resolver analysis verifies your domain's DNS records resolve the same everywhere. Mismatches can cause email delivery failures. Learn the fix.
Nameservers Explained: How the Internet Finds Your Business
Nameservers tell the internet which DNS servers are authoritative for your domain. Learn how they work and why proper configuration matters for reliability.
What CDN and DNS Providers Actually Do (And Why You Need One)
CDNs speed up your site by serving content from locations near your visitors. DNS providers route traffic and protect your domain.…
IPv4 vs IPv6: Why Your Domain's IP Address Matters
Learn the difference between IPv4 and IPv6, why both matter for your website and email, and how to ensure your domain uses modern addressing in plain English.
TXT Records: Simple Notes That Power Email and Verification
TXT records store text-based data in your domain DNS, powering SPF, DKIM, DMARC, and site verification. Learn how they work and why they matter.
SRV Records: How Services Find Your Servers
SRV records tell the internet which servers handle specific services like VoIP, chat, or LDAP for your domain. Learn how they work and why they matter.
SOA Record: The Master DNS Blueprint Every Domain Needs
An SOA record is the master DNS record for your domain. Learn how it controls zone transfers, refresh intervals, and email for the domain administrator.
CAA Records: Who Can Issue Certificates for Your Domain
CAA records tell certificate authorities which providers are allowed to issue SSL certificates for your domain, helping prevent phishing and impersonation.…
How DNS Routes Your Domain to the Right Server
DNS routing turns your domain name into the addresses that browsers and email servers need. Learn how it works, why it breaks, and how to fix common problems.
NS Records: Who Holds Your Domain's DNS Settings?
NS records tell the internet which servers hold your domain's DNS settings. Wrong records can break email and your website. Learn how to check and fix them.
AAAA Record: Pointing Your Domain to IPv6
AAAA records map your domain to an IPv6 address. Discover what they do, why they matter for traffic, and how to add one to your DNS.
CNAME Records: Giving Your Domain Multiple Names
A CNAME record lets one domain name act as an alias for another. Learn what that means for your website, subdomains, and how to fix broken CNAME records.
A Record: Your Domain’s Street Address on the Internet
An A record links your domain name to the server IP address that hosts your website. If it's wrong, your site goes offline. Learn how to check and fix it.
DNS Health Checks: Is Your Email Setup Actually Correct?
DNS health checks scan your domain’s email settings (SPF, DKIM, DMARC, MX) for misconfigurations that kill deliverability.…
DNSSEC: Verifying Your Domain’s Directions on the Internet
DNSSEC secures your domain's DNS records with digital signatures, preventing hackers from redirecting your website visitors and email to impostors.…
DKIM Explained: How Email Receivers Know It's Really You
DKIM (DomainKeys Identified Mail) digitally signs your emails to prove they’re really from you. Learn how it stops spoofing and boosts deliverability.
SPF: Who's Allowed to Send Email From Your Domain
SPF (Sender Policy Framework) is a DNS record that tells email receivers which servers are authorized to send email from your domain.…
MX Record: What It Is and Why It Matters for Your Business
An MX record tells email servers where to deliver mail for your domain. Learn why incorrect MX records cause email loss and how to fix them.
Email Security
(12)Why PayPal Shows Up in Your Domain’s DNS (and What to Do About It)
When TechSpy flags PayPal in your DNS, it means your domain is set up for secure payments. Learn what those records do and how to keep them safe.
Self-Signed TLS Certificate: What That Warning Means
A self-signed TLS certificate scrambles data but can't prove your server's identity, causing email warnings. Understand the risk and how to fix it.
MX, SPF, DKIM, DMARC: Your Email’s Delivery and Security Foundation
Understand how MX, SPF, DKIM, and DMARC work together to get your emails delivered, protect your domain from fraud, and keep your business communications …
DNS Resolver Analysis: Does Your Domain Look the Same Worldwide?
DNS resolver analysis verifies your domain's DNS records resolve the same everywhere. Mismatches can cause email delivery failures. Learn the fix.
MTA-STS: Keeping Your Emails Locked in Transit
MTA-STS enforces TLS encryption for email delivery, preventing downgrade attacks. Learn how it works and why it matters for your email security.
TLS-RPT: Get Alerts When Email Encryption Fails
TLS-RPT tells email providers to send you reports when TLS encryption fails during delivery. Learn how it improves email security monitoring.
BIMI: Show Your Logo Beside Emails and Build Trust
BIMI displays your brand's logo in supported inboxes like Gmail and Yahoo. It uses DMARC and certificates to prove authenticity, increasing trust and open …
DNS Health Checks: Is Your Email Setup Actually Correct?
DNS health checks scan your domain’s email settings (SPF, DKIM, DMARC, MX) for misconfigurations that kill deliverability.…
TLS/SSL Certificates Explained: How Your Website Stays Secure
Learn what a TLS/SSL certificate is, how encryption protects your website visitors, and why it matters for trust, SEO, and security.…
DMARC: What Happens When Someone Fakes Your Email Address
DMARC tells email receivers what to do when SPF or DKIM checks fail, stopping spoofing and protecting your brand. Learn how to set it up correctly.
DKIM Explained: How Email Receivers Know It's Really You
DKIM (DomainKeys Identified Mail) digitally signs your emails to prove they’re really from you. Learn how it stops spoofing and boosts deliverability.
SPF: Who's Allowed to Send Email From Your Domain
SPF (Sender Policy Framework) is a DNS record that tells email receivers which servers are authorized to send email from your domain.…
Security
(22)Apache HTTP Server: What It Is and Why You Should Know
Apache HTTP Server is the open-source software that serves your website to visitors. Learn how it works, why seeing it in a scan matters, and simple steps …
Nginx: The Software That Delivers Your Website to Visitors
Nginx is the web server that hands your website to anyone who asks. A poor setup can make your site slow or crash during traffic spikes.…
What Is Bootstrap? (And Why Your Site Uses It)
Bootstrap is the original responsive web framework that powers millions of websites. Learn how it works, how it is detected, and what it means for your site.
What Is Clerk? A Simple Guide to User Authentication for Apps
Clerk handles sign-ups, logins, and team management for your app with pre-built UI. Learn how it works, why it matters, and how to fix common issues.
Auth0: Who Handles Your Customer Logins (And Why It Matters)
Auth0 manages logins for your website or app. If TechSpy detects it, your domain uses a third-party authentication platform—here's what that means and how …
Stripe: What That Payment Button on Your Site Actually Does
Stripe processes online payments without storing card data. Discover why it shows up in your domain scan and how to verify your ownership.
What Is Sentry? The Error Tracker That Helps Developers Fix Bugs Faster
Sentry is a tool developers use to catch software bugs in real time. Here’s why your website might have it, how it works, and what to do if TechSpy flags it.
Why Your Domain Is Using Cloudflare (And When to Worry)
Cloudflare is a service that makes your website faster and safer. But if your TechSpy scan flagged it, here's what that means for your email and site—and …
Security & Compliance Tools: What They Signal About Trust
Learn how OneTrust, hCaptcha, and Cloudflare Bot Management are detected and what they reveal about a company's investment in privacy, security, and …
Web Servers Explained: Nginx, Apache, LiteSpeed, and What They Mean
Discover what a web server like Nginx or Apache actually does, how TechSpy detects it, and why your choice affects site speed and security.
Where Your Website Lives: Hosting and CDN, Explained
Your site's speed and reliability depend on its hosting and whether you use a CDN. Learn what hosting providers and CDNs do, how they're detected, and why …
What a Company’s Analytics Tools Say About Its Data Maturity
See Google Analytics, Segment, or Mixpanel in a TechSpy report? Learn what these tools reveal about a company’s data culture and how to interpret the results.
Scan Stages: From Basic Checks to Full Security Review
TechSpy's multi-stage scan uncovers everything from uptime to email spoofing. Learn what each stage means, why skipping one leaves you exposed, and how to …
Force HTTPS & Redirect to WWW: What It Is and Why It Matters
Learn why redirecting visitors to the secure, www version of your site protects data, boosts trust, and helps search engines—even if you're not technical.
Self-Signed TLS Certificate: What That Warning Means
A self-signed TLS certificate scrambles data but can't prove your server's identity, causing email warnings. Understand the risk and how to fix it.
Subdomain Takeover: The Hidden Danger of Forgotten DNS Records
A subdomain takeover happens when an attacker claims an abandoned service your subdomain points to, using your trusted domain to host malicious content.…
Wildcard SSL: One Certificate for All Your Subdomains
A wildcard SSL secures your domain and all subdomains at once. Understand how it works, the security risks, and what to do if TechSpy flagged it.
IP Reputation & Email Blacklists: Why Your Emails Don’t Arrive
IP reputation is the hidden score that decides if your business emails reach customers. Learn how blacklists work, what hurts your score, and how to fix …
HTTP vs HTTPS: Why That ‘S’ Is Crucial for Your Website
Learn the difference between HTTP and HTTPS, why the 'S' is crucial for trust, SEO, and security, and how to fix common web reachability issues that TechSpy …
CAA Records: Who Can Issue Certificates for Your Domain
CAA records tell certificate authorities which providers are allowed to issue SSL certificates for your domain, helping prevent phishing and impersonation.…
DNSSEC: Verifying Your Domain’s Directions on the Internet
DNSSEC secures your domain's DNS records with digital signatures, preventing hackers from redirecting your website visitors and email to impostors.…
TLS/SSL Certificates Explained: How Your Website Stays Secure
Learn what a TLS/SSL certificate is, how encryption protects your website visitors, and why it matters for trust, SEO, and security.…
Customer.io: What It Is and Why It’s Showing in Your DNS
Your domain scan flagged Customer.io — an automated messaging platform. Learn what it does, how DNS records tie into it, and how to keep your emails delivering.
SendGrid: Why It's in Your DNS and What It Does for Your Email
SendGrid is a Twilio email delivery platform used for marketing and transactional emails. If TechSpy shows SendGrid in your DNS, this explains why it's …
HubSpot: What Your TechSpy Scan is Telling You
HubSpot is the CRM and marketing platform that sends emails from your domain. Here's why it needs your SPF, DKIM, and CNAME — and how to set them up so your …
Email Delivery Tools: SendGrid, Customer.io, Iterable Explained
Learn how email delivery tools like SendGrid, Customer.io, and Iterable help businesses send marketing emails reliably, and how they differ from email security.
What CRM and Marketing Automation Tools Reveal About a Business
HubSpot, Salesforce, Mailchimp, and others power email outreach. Discover how they’re spotted in a DNS scan and what that says about a company’s revenue engine.
Scan Stages: From Basic Checks to Full Security Review
TechSpy's multi-stage scan uncovers everything from uptime to email spoofing. Learn what each stage means, why skipping one leaves you exposed, and how to …
IP Reputation & Email Blacklists: Why Your Emails Don’t Arrive
IP reputation is the hidden score that decides if your business emails reach customers. Learn how blacklists work, what hurts your score, and how to fix …
MX Records: Where Your Incoming Email Actually Goes
MX records tell the world where to deliver email for your domain. If they're wrong, your inbox stays empty. Learn how they work and how to fix common issues.
MX, SPF, DKIM, DMARC: Your Email’s Delivery and Security Foundation
Understand how MX, SPF, DKIM, and DMARC work together to get your emails delivered, protect your domain from fraud, and keep your business communications …
TLS-RPT: Get Alerts When Email Encryption Fails
TLS-RPT tells email providers to send you reports when TLS encryption fails during delivery. Learn how it improves email security monitoring.
MX Record: What It Is and Why It Matters for Your Business
An MX record tells email servers where to deliver mail for your domain. Learn why incorrect MX records cause email loss and how to fix them.
Deliverability
(12)Customer.io: What It Is and Why It’s Showing in Your DNS
Your domain scan flagged Customer.io — an automated messaging platform. Learn what it does, how DNS records tie into it, and how to keep your emails delivering.
SendGrid: Why It's in Your DNS and What It Does for Your Email
SendGrid is a Twilio email delivery platform used for marketing and transactional emails. If TechSpy shows SendGrid in your DNS, this explains why it's …
HubSpot: What Your TechSpy Scan is Telling You
HubSpot is the CRM and marketing platform that sends emails from your domain. Here's why it needs your SPF, DKIM, and CNAME — and how to set them up so your …
Why PayPal Shows Up in Your Domain’s DNS (and What to Do About It)
When TechSpy flags PayPal in your DNS, it means your domain is set up for secure payments. Learn what those records do and how to keep them safe.
Email Delivery Tools: SendGrid, Customer.io, Iterable Explained
Learn how email delivery tools like SendGrid, Customer.io, and Iterable help businesses send marketing emails reliably, and how they differ from email security.
What CRM and Marketing Automation Tools Reveal About a Business
HubSpot, Salesforce, Mailchimp, and others power email outreach. Discover how they’re spotted in a DNS scan and what that says about a company’s revenue engine.
IP Reputation & Email Blacklists: Why Your Emails Don’t Arrive
IP reputation is the hidden score that decides if your business emails reach customers. Learn how blacklists work, what hurts your score, and how to fix …
DNS Resolver Analysis: Does Your Domain Look the Same Worldwide?
DNS resolver analysis verifies your domain's DNS records resolve the same everywhere. Mismatches can cause email delivery failures. Learn the fix.
How DNS Routes Your Domain to the Right Server
DNS routing turns your domain name into the addresses that browsers and email servers need. Learn how it works, why it breaks, and how to fix common problems.
BIMI: Show Your Logo Beside Emails and Build Trust
BIMI displays your brand's logo in supported inboxes like Gmail and Yahoo. It uses DMARC and certificates to prove authenticity, increasing trust and open …
DNS Health Checks: Is Your Email Setup Actually Correct?
DNS health checks scan your domain’s email settings (SPF, DKIM, DMARC, MX) for misconfigurations that kill deliverability.…
DKIM Explained: How Email Receivers Know It's Really You
DKIM (DomainKeys Identified Mail) digitally signs your emails to prove they’re really from you. Learn how it stops spoofing and boosts deliverability.