please dont rip this site

Validating an email address before (or without) sending an email

telnet  'this responds with the mail server infor
helo 'sends request to mail server
mail from: <> ' you need this so their is a sender should reply ok
rcpt to: <> '  this will check for a valid mailbox on that domain

For example...

220 ESMTP server (Post.Office v3.5.3 release 223 ID# 0-0U10L2S100V35) ready Tue, 11 Sep 2001 12:22:27 -0700
250 Sender <> Ok
rcpt to:<>
550 Invalid recipient <>
rcpt to:<>
250 Recipient <> Ok

See also:

file: /Techref/inet/smtpvalidate.htm, 1KB, , updated: 2012/11/16 13:26, local time: 2024/7/15 10:58,

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