Catch-all domains explained: why 'accept all' makes verification hard
A catch-all domain accepts mail for every address, real or not, so a verifier cannot confirm a mailbox. Here is how we detect it and how to mail those contacts safely.
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Deliverability, explained.
Guides and research on email verification, bounce rates, catch-all domains, disposable addresses, list hygiene and sender reputation. Written by the people who run the engine.
4 posts tagged smtp
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@Greylisting explained for marketers: why some mail is delayed
Greylisting is a mail server tactic that temporarily rejects unfamiliar senders with a 4xx code and accepts the retry. What it looks like in your reports, how long it lasts and what to do.
@What is email verification and how does SMTP verification work?
Email verification checks whether an address can really receive mail. We walk through syntax, MX, reputation lists, the SMTP handshake, catch-all probes and scoring.
@Hard bounce vs soft bounce: what the difference means for you
A hard bounce is a permanent rejection (5xx), a soft bounce is temporary (4xx). What causes each, how ESPs handle them, and when a soft bounce should be treated as hard.
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