From: Jan P. Kessler (no email)
Date: Fri Feb 01 2008 - 11:20:44 EST
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 <>: 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 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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