From: Wietse Venema (wietseporcupine.org)
Date: Fri Dec 14 2007 - 13:12:53 CST

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Paul Rogers:
> > No replies for an MX lookup? You're using a toy DNS server.
>
> On a more general note, if I'm trying to relay messages out
> through my ISP's SMTP server & my account there, why is my
> postfix even doing DNS lookups?

Because you configured it that way. Postfix does not know that you
want to use the ISP's mailhost if you don't tell it to.

> I thought I could set this
> up as though it were, say, a Thunderbird client, send up
> messages to the ISP's SMTP, in effect saying, "Here, send this
> for me. You handle it." In all the reading I've found in web
> pages, I guess I'm still confused about the "division of labor".
> I can send mail with Thunderbird through my ISP on a different,
> more modern system.

To send all mail to the ISP's mailhost, point your Thunderbird client
at the ISP and be done with it.

However, if you must use an MTA such as Postfix:

main.cf:
   relayhost = [mail.isp.com]

where mail.isp.com is the client that Thunderbird would connect to.

The [] are required.

If the mailhost won't accept mail for other destinations without
you logging in first, then come back here to set up SASL authentication.

        Wietse

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