[Mailman-Developers] before next release: disable backscatter indefault installation

[Ian Eiloart]

--On 10 March 2008 10:46:39 -0700 Kenneth Porter <shiva at sewingwitch.com> 
wrote:

> --On Monday, March 10, 2008 10:19 AM +0000 Ian Eiloart
> <iane at sussex.ac.uk> wrote:
>
>> Yep, it would be the easiest way to integrate acceptance testing with
>> Exim.  It's common for sites to put Exim installations in front of
>> Exchange  servers (for security reasons), and do SMTP call forwards to
>> test  deliverability.
>
> Another approach is to dump the valid users list periodically using a
> Windows-based LDAP app and then copy that to the OSS front end MTA for
> validation. Check the MIMEDefang list archives for howto.

That's pointless with Exim. Exim's capable of querying the LDAP server 
directly to check the existence of a user - so people can use their 
accounts as soon as they're created. The advantage of a call forward is 
that it allows for other factors that might determine deliverability, such 
as quota problems, personal filters or whatever other features the backend 
might support. Call forwards are definitive, and don't require knowledge of 
the nature of the backend.

-- 
Ian Eiloart
IT Services, University of Sussex
x3148