telnet 192.168.0.6:25 'this responds with the mail server infor helo my.domain.com 'sends request to mail server mail from: <email@example.com> ' you need this so their is a sender should reply ok rcpt to: <firstname.lastname@example.org> ' this will check for a valid mailbox on that domain
220 nt.massmind.org ESMTP server (Post.Office v3.5.3 release 223 ID# 0-0U10L2S100V35) ready Tue, 11 Sep 2001 12:22:27 -0700 HELO nt.massmind.org 250 nt.massmind.org MAIL FROM:<email@example.com> 250 Sender <firstname.lastname@example.org> Ok rcpt to:<email@example.com> 550 Invalid recipient <firstname.lastname@example.org> rcpt to:<email@example.com> 250 Recipient <firstname.lastname@example.org> Ok
|file: /Techref/inet/smtpvalidate.htm, 1KB, , updated: 2012/11/16 13:26, local time: 2019/7/15 14:59,
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<A HREF="http://www.sxlist.com/techref/inet/smtpvalidate.htm"> Validating and email address before (or without) sending an email</A>
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