220-mail.provider.net ESMTP Sendmail EL-8933/8.9.3; Thu, 12 Apr 2001 16:40:22 -0700 (PDT) HELO mainmatter.com 250 mail.provider.net Hello dialup-server.net [164.52.54.143], pleased to meet you MAIL FROM:<[email protected]> 250 [email protected]... Sender ok RCPT TO:<[email protected]> 250 <[email protected]>... Recipient ok [... Message transmission follows ...]
Figure 2: Start of an SMTP client-server message transfer dialog.