From Pastebin:
Sep 15 08:58:46 mail postfix/smtp[8234]: 3315A1ED07C8:
to=<
as123...@sapo.pt>, relay=
mx.ptmail.sapo.pt[212.55.154.36]:25,
delay=64434, delays=64070/360/3.5/0.12, dsn=4.0.0, status=deferred
(host
mx.ptmail.sapo.pt[212.55.154.36] said: 451-Ligacao
Temporariamente recusada, se o problema persistir contacte o seu
fornecedor de servico 451-Se acede a partir de um IP dinamico (ADSL
ou dial-up, por exemplo) por favor configure o envio de e-mail para
utilizar o seu ISP. 451- -- 451-Connection refused temporarily, if
it persists contact your ISP. 451 If your IP is a dynamic one (ADSL
or dial-up, for instance) please reconfigure your outgoing settings to
use your ISP server. (#4.5.13) (in reply to RCPT TO command))
The remote server doesnt like your IP as its on a Dynamic block. So
they are refusing your mail.
--
The mysteries of the Universe are revealed when you break stuff.