Mailtrix Blog
Email verification guides, deliverability tips, and best practices for senders.
Email List Hygiene: How Often Should You Clean Your List?
Email lists decay at 30% per year. Here's how to tell when your list needs cleaning and how often to do it to protect your sender reputation.
SMTP Email Verification Explained: What Happens Behind the Scenes
SMTP verification is the gold standard for checking if an email address actually exists. Here's exactly what happens during a verification, step by step.
Disposable Email Addresses: What They Are and How to Block Them
Throwaway emails pollute your list and skew your metrics. Here's how disposable email detection works and how to block them at signup.
Bulk Email Verification: The Complete Guide
Everything you need to know about bulk email verification — how it works, what to look for in a tool, and how to clean your list the right way.
What Is Email Bounce Rate and How to Fix It
A high email bounce rate tanks your deliverability and can get your domain blacklisted. Here's what causes it and how to fix it fast.
How to Check Email Address Validity (Without Sending a Test Email)
Sending a test email to verify an address is wasteful and unreliable. Here's how to check email address validity properly using SMTP verification.
Light Mode — The Old Paper Feel
Mailtrix's light mode isn't your typical white theme. It's warm, paper-textured, and easy on the eyes.
Credit Usage Graph & Billing Analytics
See exactly where your credits are going — by day, by job, and over time — with the built-in usage graph.
Real-Time API Usage Tracking
Monitor how many API calls your keys make per hour and per day — all from your dashboard.
Introducing API Keys — Programmatic Access
Integrate Mailtrix directly into your app with API keys. Verify emails at signup, in workflows, or anywhere in your stack.
How Mailtrix Protects Your Sender Reputation
A high bounce rate kills deliverability. Here's how verifying before you send keeps your reputation clean.
Single Email Verify — Instant Validation
Check one email address in real-time before adding it to your list — costs just 1 credit.
Introducing Bulk Email Verification
Upload a CSV, hit Start, and get back a clean list — thousands of emails verified in minutes.
Getting Started with Mailtrix
Everything you need to know to start verifying emails and protecting your sender reputation from day one.
Spam Traps: What They Are, How They Get on Your List, and How to Avoid Them
Spam traps are email addresses that exist only to catch senders with poor list hygiene. Hitting one can land you on a blocklist. Here's how each type works and how to stay clear.
Should You Buy an Email List? Here's What Actually Happens
Buying an email list looks like a shortcut to a bigger audience. In practice it usually means high bounce rates, spam traps, and a damaged sender reputation. Here's what really happens when you hit send.
What Is a Catch-All Email Domain? (And How to Send to One Safely)
A catch-all domain accepts mail for any address — even ones that don't exist. Here's how catch-alls work, why no verifier can fully confirm them, and how to email them without wrecking your bounce rate.
What Is Greylisting? Why Some Valid Emails Verify as Unknown
Greylisting is a spam defence that tells senders 'try again later.' Here's how it works, why it delays email, and why it can make verification results come back Unknown.
Role-Based Email Addresses: Should You Send to info@ and sales@?
Addresses like info@, sales@ and support@ belong to teams, not people. Here's why they behave differently, when it's fine to email them, and when to leave them out.