Email Security Articles
Browse our email security articles for strategies, checklists, and practical guidance you can apply right away.
Find an article
Search by title, category, or topic.
Quick links
Browse by topic
Jump into the parts of email verification and deliverability you need right now.
Email Deliverability and Domain Verification: A Complete Guide
Domain verification and email authentication are essential for email deliverability. Learn how they work, why they matter, and the best practices for setting them up.
Role-Based Email Addresses: Risks, Credibility, and Best Practices
Role-based email addresses like info@, admin@, and support@ create deliverability risks and compliance concerns. Learn why they're problematic and how to handle them.
Email Delivery vs. Email Deliverability: Understanding the Difference
Email delivery and email deliverability are different things. Understanding the distinction — and how to improve both — is essential for inbox placement success.
More reading
Latest articles from the library
Why Use Bulk Mail Verifier: Features, Benefits, and Tips
Bulk Mail Verifier checks your email list for invalid addresses, spam traps, and deliverability risks. Learn the key features, how they protect your campaigns, and how to get the most out of the tool.
Mailchimp Omnivore: What It Is, What Triggers It, and How to Fix It
Mailchimp Omnivore warnings mean your email list has quality issues that could block sends. Learn what triggers them, how to resolve them, and how to prevent them from recurring.
How to Trace an Email Sender's Location in Gmail: Step-by-Step Guide
Tracing an email sender's location in Gmail starts with reading email headers. Here's a complete step-by-step guide — what you can find, what Gmail hides, and what to do when the location matters for security.
Email Verifier: What It Is, How It Works, and Why You Need One
Learn what an email verifier is, how it works, and why it's essential for protecting your sender reputation and improving email deliverability.
How to Trace an Email Address to Its Owner: 4 Effective Methods
Need to identify who's behind an email address? Here are four effective methods — from header analysis and Google search to people search services — with step-by-step guidance and legal considerations.
Valid Email Address Format: Rules, Examples, and How to Validate
What makes an email address valid? Learn the exact format rules, common error patterns, and how to validate email addresses in your forms and lists.
How to Identify the Owner of a Gmail Account
Need to identify who's behind a Gmail address? Here are the most effective methods — from email headers and social media to dedicated lookup tools — and when to use each one.
10 Email Marketing Lessons Every Marketer Needs to Apply
Email marketing continues to evolve — and the marketers who adapt win. Here are 10 lessons that define effective email strategy today, from list verification and privacy to personalization and interactivity.
What Is Emailondeck? Disposable Emails Explained (And Why Marketers Need to Detect Them)
Emailondeck provides disposable email addresses for privacy, testing, and spam prevention. Here's how it works, when to use it — and why email marketers need to detect and block these addresses from their lists.
8 Email Security Best Practices That Actually Protect Your Organization
Email is the primary vector for 91% of cyberattacks. These 8 security practices protect your accounts, your data, and your sender reputation from the most common threats.
BulkMailVerifier vs. ZeroBounce: Which Email Verification Service Should You Use?
BulkMailVerifier and ZeroBounce are both capable email verification services — but they differ significantly on pricing, accuracy, API capability, and value. Here's a detailed comparison to help you choose.
Email Address Validation: The Complete Guide
Email address validation confirms whether an address is real, correctly formatted, and safe to send to. This guide covers how it works, why it matters, and best practices.
Professional Email Account Setup: A Complete Beginner's Guide
Setting up a professional email account with your own domain builds credibility and improves deliverability. This guide covers the full setup process for Google Workspace and other major providers — plus what to do after setup to ensure your emails land in inboxes.
Millionverifier vs ZeroBounce: A Comprehensive Comparison for Email Verification (2026)
Millionverifier vs ZeroBounce: a detailed side-by-side comparison of features, accuracy, pricing, and integrations—plus a third option that delivers enterprise-grade verification at a fraction of the cost.
Email Inbox Placement: How to Master Your Sender Reputation
Sender reputation determines whether your emails land in the inbox or the spam folder. Learn what affects it, how to measure it, and how to improve it.
What Is an Email Checker? How It Works and Why It Matters
An email checker verifies whether email addresses are real and deliverable. Learn how email checkers work, why they matter, and how to choose the right one.
What Is a Catch-All Email? Impact on Deliverability and How to Handle It
A catch-all email accepts all incoming mail for a domain regardless of whether the specific address exists. Learn what this means for deliverability and how to handle catch-all addresses in your list.
Why Your Emails Are Going to Spam (And How to Fix It)
About 1 in 5 legitimate emails ends up in the spam folder. Learn why this happens and the exact steps to fix it and get your emails back into the inbox.
Sending IP Reputation: How to Check It, Fix It, and Protect It
Your sending IP reputation directly determines whether your emails reach the inbox or the spam folder. Here's how to check where you stand, what's hurting your score, and how to systematically improve it.
How Bounce Rates Damage Email Sender Reputation (And How to Fix It)
High bounce rates damage your sender reputation, hurt deliverability, and can get your domain blacklisted. Learn exactly how bounces affect your sender score and what to do about it.
How to Boost Cold Email Deliverability: A Complete Guide
Cold email deliverability requires a verified list, warmed sending infrastructure, and careful sending practices. Here's everything you need to land in the inbox.
How to Choose the Right SMTP Port: A Complete Guide to 25, 465, 587, and 2525
The SMTP port you choose affects whether your emails are delivered, blocked, or rejected. Here's a complete guide to SMTP ports 25, 465, 587, and 2525 — when to use each, and how they affect deliverability and security.