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:<rkiesling@mainmatter.com>

250 rkiesling@mainmatter.com... Sender ok
RCPT TO:<ckiesling@mainmatter.com>

250 <ckiesling@mainmatter.com>... Recipient ok
[... Message transmission follows ...]

Figure 2: Start of an SMTP client-server message transfer dialog.

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