> 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:<[EMAIL PROTECTED]> for example), they refuse it with a 572 error: [EMAIL PROTECTED] host name is unknown. But, if i telnet MAIL FROM:<[EMAIL PROTECTED]>, they accept the message. In this case, recipient was [EMAIL PROTECTED] 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 -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
