Am 01.10.2012 18:17, schrieb Alumno Etsii:
> Hi list!
> 
> I've successfully setup my Postfix server with virtual users (using MySQL), 
> let's call this machine 'mail'. I've
> another server (machine) that relays through 'mail' to send mails, let's call 
> it 'client'. Whenever I try to send
> an e-mail from 'client' relaying through 'mail', I can do this only if the 
> destination is the same domain that
> 'mail' is configured to handle. Otherwise, I get an error like this:

Oct  1 17:08:44 mail postfix/qmgr[2661]: 579AA10042B: 
from=<r...@client.devels.es>, size=931, nrcpt=1 (queue active)
Oct  1 17:08:45 mail postfix/smtp[4952]: 579AA10042B: 
to=<todos.somos...@gmail.com>,
relay=devels.es[91.215.158.237]:25, delay=1.3, delays=0.14/0.11/0.83/0.19, 
dsn=5.0.0, status=bounced (host
devels.es[91.215.158.237] said: 550-Verification failed for 
<r...@client.devels.es> 550-The mail server could not
deliver mail to r...@client.devels.es.  The account or domain may not exist, 
they may be blacklisted, or missing
the proper dns entries. 550 Sender verify failed (in reply to RCPT TO command))

so is "r...@client.devels.es" a VALID RCPT on your MX?

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