(reason: 530 5.7.1 Mail from 210.55.220.207 rejected. See http://www.mail-abuse.com/support/lookup.html:
Looks like they think your IP address is listed in MAPS. It is - well, it's on the DUL (DialUp List) which suggests to me that you're running your own MTA, and not sending via your ISP.
MAPS have some documentation to help you change your local MTA's routing, in order to send all your mail to your ISP, rather than directly.
http://www.mail-abuse.com/an_rteoutgoing.html
In the case of sendmail (which is what I think Steve is using) :-
Add these lines to your sendmail.mc file:
define(`SMART_HOST',`mail.yourisp.net')dnl <--- Your ISP's mail server name goes here MASQUERADE_AS(yourisp.net)dnl <--- Your ISP's domain name goes here FEATURE(`allmasquerade')dnl FEATURE(`masquerade_envelope')dnl
-jim
