Topic

Email address verification

The practice of checking whether an email address is syntactically valid, belongs to a domain that accepts mail, and corresponds to a real mailbox, usually at signup or before a bulk send.

Current clusters

build1 publisher

Port 25 decides which email check you can actually run

An MX lookup is one DNS query proving a domain has mail servers. Confirming a specific mailbox means opening port 25 from an IP that Gmail will answer, so MailProbe ships that check only in its self-hosted build.

Publishers:dev.to

Reality

Evidence40
Adoption: Insufficient
Hype gap+10
Incentives70
Confidence55