> Actually, the problem isn't solved, since the problem was with the
>recipient's callouts. They should be checking all your MX servers. They
>should not be hard failing on a temporary error.
>
> Who was the recipient?
Hi Ian,
We could not send any email to ua.pt domain.
In response to MAIL FROM for our mail server (MAIL FROM:<example@???>
for example), they refuse it with a 572 error: example@??? host name
is unknown.
But, if i telnet MAIL FROM:<example@???>, they accept the
message. In this case, recipient was postmaster@???
What i understand, is that they make some kind of host/sender verification
policy, by testing if the right part at '@' is a valid host.
esenf.pt is not a real host, but mail.esenf.pt is (our mail server).
Tom Kistner advise me that maybe the reason was the our lowest priority MX
server point to a fake address (host mx0.esenf.pt not found:
3(NXDOMAIN)). I remove that entry in dns and the messages start to be
accepted.
Like you say, i suppose too that they should checking all ours mx servers,
but apparently if they received a failed response at first time they
refuse the message.
I'm not a truly mx expert, so what is going wrong here?
Regards,
Paulo Almeida
--
Escola Superior de Enfermagem do Porto
Rua Dr. António Bernardino de Almeida
4200-072 Porto - Portugal
Tel: +351 22 5073500 - Fax: +351 22 5096337
http://portal.esenf.pt
--
Escola Superior de Enfermagem do Porto
Rua Dr. António Bernardino de Almeida
4200-072 Porto - Portugal
Tel: +351 22 5073500 - Fax: +351 22 5096337
http://portal.esenf.pt
