The MailSure blog
Email verification, deliverability and clean lists
Practical guides for marketers and developers who want their email to reach real people.
What is sender reputation and how do you protect it?
Mailbox providers decide where your email lands based on your track record. Here is what goes into your reputation and how to build it.
How to warm up a new sending domain or IP
Mailbox providers don't trust unknown senders. Warming up means building volume gradually so they learn you are legitimate.
Gmail and Yahoo's bulk sender rules: what you need to do
Since 2024, Gmail and Yahoo require authentication, easy unsubscribes and low spam complaints from bulk senders. A practical checklist.
SPF, DKIM and DMARC in plain English
Three DNS records decide whether your email is trusted. What each one does, and how to check yours, without the jargon.
What are spam traps and how do they get onto your list?
Spam traps are addresses that exist to catch careless senders. Here are the types, how they end up on a list and how to stay clear of them.
Catch-all domains explained
A catch-all domain accepts mail for any address, real or not. That makes verification harder and these addresses riskier. Here is how to deal with them.
What is a good email bounce rate?
How bounce rate is calculated, what level is worth worrying about, and the quickest ways to bring it down.
How email bounces work: hard vs soft bounces
A bounce is a rejection notice from the receiving server. Hard and soft bounces mean very different things, and you should treat them differently.