From: Jan P. Kessler (postfixjpkessler.info)
Date: Fri Feb 01 2008 - 10:20:44 CST

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Ralf Wiegand schrieb:
> Feb 1 09:58:41 otto postfix/smtp[19235]: [ID 197553
> mail.info] 1628B56E69: host
> mx.mail.isp.net.th[202.5.93.222] said: 453 sorry,
> mailbox currently unavailable (#5.2.1) (in reply to
> RCPT TO command) Feb 1 10:26:30 otto
> postfix/smtp[19227]: [ID 197553 mail.info] 83BDD56F27:
> host
> mx1-atlascopco-com.emailfiltering.com[194.116.198.18]
> said: 421 <cyprusnwjatlascopco.com>: Deferring
> connection (in reply to RCPT TO command)
>
>
> Both email addresses are not ours. Our email server
> (otto) is sending us this log messages as an alert.
> But an alert of what?
>

This tells that a mail to cyprusnwjatlascopco.com could not be sent.
This could be one of your users sending to this address or backscatter
originated by your system. Do you verify your recipients before
accepting a mail? Could you submit a "grep 83BDD56F27 /your/maillog"?

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