[TriLUG] sendmail smart-host with auth

[Chad Thomsen]

Are you sure its not a case of the ISPs are doing reverse DNS checks on your
mail servers IP?  I just setup a new system here at work and that was the
case.  The DNS records on the mail servers outgoing IP were no existant so a
lot of ISPs were dropping any SMTP connection attempts.  This caught me off
guard as it had been several years since I had setup a mail system and back
then nobody did reverse lookups but then again back then spam was not an
issue either.

Chad

On 3/29/06, Aaron S. Joyner <aaron at joyner.ws> wrote:
>
> Brian Henning wrote:
>
> > Hi Folks,
> >   I've done some googling on this but so far the solutions seem a
> > little convoluted, so I'm posing the question to the list in the hopes
> > of there being some simple answer I just haven't found yet.
> >
> > Anyway, lately I've encountered more and more problems related to
> > sending mail from an IP in a dynamic range [this is my MTA at home],
> > so I figure the best answer would be to smart-host through my ISP's
> > MTA. Problem is, in order to help curtail spam, the ISP has started
> > requiring authentication to send mail.
> >
> > How hard is it to configure sendmail (8.12.11) to authenticate for
> > smart-hosting?
> >
> > Tanks!
> > ~Brian
> >
> A quick google for 'sendmail smtp auth outgoing' turned up this as the
> 2nd hit:
> http://efflandt.freeshell.org/sbc-smtp-auth.html
>
> I knew the basic answer was "pretty simple", and it's pretty cleanly
> detailed on that page.  If you run into any problems, post back again!  :)
>
> Aaron S. Joyner
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