Accept-all vs catch-all describe the same thing: a domain that accepts mail to any address. Verifiers say accept-all, admins say catch-all. Here is what it means.
An unknown email status means a verifier could not confirm whether an address is deliverable. It is undetermined, not invalid, usually caused by catch-all domains or greylisting hiding the answer.
Greylisting is an anti-spam technique that temporarily defers a first delivery and accepts it on retry, which can make email verifiers return an unknown status.
Real-time email verification checks a single address the instant it is entered, via API in under a second, blocking fake and mistyped emails at the point of capture.
Email syntax validation checks an address is formatted right: local part, @ and valid domain. It is the fast first verification step. Full guide below.
An MX record is the DNS entry that points to a domain's mail server. Verifiers check it first: no MX record means no mail can arrive. Full guide below.
Email validation vs verification: validation checks an address is formatted correctly, verification confirms the mailbox actually exists. See what each catches and which you need. Full comparison inside.
A role-based email like info@ or sales@ points to a team, not a person. See what they are, why verifiers flag them, and whether to send. Full guide below.
An SMTP check is how email verifiers confirm a mailbox exists: the tool pings the recipient mail server and reads its reply, without sending a real message.
How fast do email lists decay? Industry data puts B2B list rot at roughly 22.5% per year, with decay rates by list age and role plus how verification keeps a list current.
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