Do you have a system monitoring the SMTP port on that server? I get these once a minute from my monitoring system, that's just checking to make sure the daemon's alive.
Matt Chapman wrote:
sendmail[2427]: h8PG5C9C002427: smtpout.mac.com [17.250.248.97] did not
issue MAIL/EXPN/VRFY/ETRN during connection to MTA
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