From: mouss (moussnetoyen.net)
Date: Fri Feb 01 2008 - 15:55:54 CST

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Ralf Wiegand wrote:
> 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.

"both" what? I only see one email address in your post.

> Our email server
> (otto) is sending us this log messages as an alert.
>

try another mail server. postfix would be a natural replacement for your
"otto".

> But an alert of what?
>

There's no alert here. postfix is telling you that the remote server
didn't like the transaction. if you don't like it, find the admin of the
remote system and shoot him.

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