[Pkg-exim4-users] Authentication

[Marc Haber]

On Fri, Aug 25, 2006 at 10:13:00AM +0100, Neil Briscoe wrote:
> One client (actually this one) is so lame it sends a HELO rather than an 
> EHLO and doesn't receive an authentication advertisement.

If it says HELO, it does only speak plain SMTP, which does not know
about extensions and thus cannot support authentication. There is
nothing exim can do.

> So I had to resort to using Outlook Express (urgh) in order to trial 
> things.  It will work - but only if the client address is listed in the 
> relay_nets range in update-exim4.conf.conf

By allowing exim to relay unconditionally you are effectively
switching off authentication. Some very broken Outlook Express
versions demand "250-AUTH=" instead of "250-AUTH " as authentication
advertisement.

Exim can be coaxed into issueing this advertisement by uncommenting
the support_broken_outlook_express_4_server authenticator in the
configuration.

> So my question is what is the way to get authentication to work without 
> there having to be an entry in that field?

You are _not_ making authentication work by entering IP addresses in
relay_nets - you're doing the opposite. Which is not a big problem if
the client in question has a static IP address.

Greetings
Marc

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