> # host -t mx esenf.pt
> esenf.pt mail is handled by 5 mx0.esenf.pt.
> esenf.pt mail is handled by 10 mail.esenf.pt.
> esenf.pt mail is handled by 1000 mx.fakemx.net.
>
> # host mx0.esenf.pt
> Host mx0.esenf.pt not found: 3(NXDOMAIN)
>
> Not sure about the remote host's policy, but I guess this is the reason
Oh yes... maybe you are right.
mx0.esenf.pt is a fake mx record that point to a dead ip (perhaps
it's more appropriate to point to an real ip with the port 25 closed)
and mx.fakemx.net is a free fake mx service offered by fakemx.org,
that temporary reject with a "451 Try again later" message for
anti-spam purposes. I try this well know trick many years ago, but
sinceraly i don't know if it's really useful and efective.
For now i removed from dns server the mx0 record, wait for propagation
process of our updated domain name and then i will test if that solved the
problem.
Many thanks
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
