Re: [tlug] (OT) Reverse DNS resolution blues- ISP recommendations?

[Brett Robson <b-robson@??>]

Curt Sampson wrote:
> Well, that's pretty bogus if that's indeed what's happening, but on the
> other hand, there's not much you can do about it for those cases except
> conform to what they want.
>
> But you may want to check that this is really your problem. I've not 
> had an
> issue with this, and the two servers I usually send mail from resolve as:
>
> $ host 58.81.178.245
> 245.178.81.58.in-addr.arpa domain name pointer 
> 58x81x178x245.ap58.ftth.ucom.ne.jp.
> $ host 125.100.126.202 202.126.100.125.in-addr.arpa domain name 
> pointer 125x100x126x202.ap125.ftth.ucom.ne.jp


That's pretty well guaranteed to be rejected by many mail servers, quite 
likely when you connect. Mail is not supposed to come from domain names 
containing ftth, dsl, dailup; that sets of the spam alarms like nothing 
else, except perhaps coming from China or Korea. If you want to run your 
own server you need to have a "proper" reverse dns name and best of all 
relay through your ISP's server.

Having a blacklisted IP block doesn't help either.

Brett