Question regarding UCE, e-mail, and customer accounts

[djcronos]

I have a customer who keeps complaining that she isn't able to send e-mail to certain people because certain mail servers think she is a spammer. I've checked all the spamlists and couldn't find her anywhere. Then I got to thinking - maybe it's because when you do a reverse lookup, her IP address is being resolved to my domain.

Or could it be the fact that for every IP address that I have assigned to the box, doing a reverse lookup will show my domain name? For example, every single IP address that I have assigned to that box reverses to bar.com. Could that be the problem? Should I remove all those entries?

Any info on this would be helpful. Thanks in advance.

 

[nobaloney]

That shouldn't be the problem.

RFCs say reverse DNS has to exist but doesn't say it has to refer back to anything specific; only to a name that has an A record pointing to the same IP#.

Think about it; you run a shared server. You can only have one reverse DNS entry per IP#. Exim always uses the main IP# to send email.

There's no way you could have reverse DNS for each domain. We generally do reverse DNS to our hostname for each machine.

That way if someone needs us to do some work for them we can easily find out which machine they're on by doing an nslookup for their domain name, and then another for the IP# we get as a result of the first.

Jeff

 

[djcronos]

Found the problem - the mail server in question was messed up. Turns out to be their issue.

Thanks for the response.