Dirk Laurenz:
> Hello $list,
>
> my server rejects an email from certiain domain:
>
> <onl...@server.sub.dom.local>: host
>     server.sub.dom.local [xx.xx.xx.xx] said: 550 5.7.1
>     <onl...@server.sub.dom.local <mailto:onl...@server.sub.dom.local> >:
> Recipient address rejected:
>     Recipient domain dom.local is not used. (in reply to RCPT TO command)

Your Postfix is rejecting mail because a REMOTE SMTP SERVER
[xx.xx.xx.xx] is rejecting the mail.

> The sender has changed his mail from u...@sub.dom.com
> <mailto:u...@sub.dom.com>  to u...@dom.com <mailto:u...@dom.com>

Can you see that remote SMTP server is complaining about the OLD
form onl...@server.sub.dom.local not the NEW form u...@dom.com.

        Wietse

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