SMTP question. Sendmail, RH 7.3

[Travis Roy]

> I have a client in MN who uses qwest as his isp. I host his site and email
> and until yesterday at 3 pm he was able to send and receive just fine. His
> POP address is domain.com and his smtp address was something.qwest.net. In
> his calls to qwest he is getting the usual runaround "you can't
> just use our
> smtp server, you have to have a qwest email account and send/receive from
> that account". What has changed? is there anything I can do aside
> from open
> my server up to relay for every qwest customer in MN? Please help quick!
> Sorry if this is OT, running RH 7 with sendmail. Please forgive any
> misterminology.

There's a couple things you can do. First is he can get a quest email
account and only use it to send. Probably just needs SMTP Auth.

You can set up Pop-Auth or pop before smtp on your sever. That is they check
their email via pop (or imap) and then it allows his IP address for the next
15mins to send mail via your smtp server (I used to do this myself)

The best way is probably to set up SMTP auth on your server, with SSL if
possible. That way they have to pass you a user name a password to send mail
(this is what I currently do)