Lindsay Haisley wrote:
> Thus spake Alessandro Vesely on Fri, May 14, 2004 at 01:42:12AM CDT
> > >
> > Pardon my intrusion, but this option looks like requiring two servers:
> > one to accept incoming mail from any "stupid client" and the other for
> > filtering e-mail according to varying recipients' requirements.
>
> I don't think so. A single server can handle the job, but should be able to
> disable content filtering based on certain criteria. I can use embedded
> maildrop to do exactly this, and no separate server is required.
This is probably correct for anti-spam, and anti-virus should be a global
filter. So it works fine. But then you have to resort to delivery maildrop
if you want to apply any other optional filtering.
> The issue boils down to the fact that SMCs ('stupid mail clients') are far
> more likely to need an exemption from content filtering than are remote
> servers.
To be honest to MUAs, we should note that to properly handle 4xx
responses one needs to manage a queue, which in general is not
their job (although trying once more would suffice in this case.)
> I would guess that generally, IPs permitted to relay by the
> RELAYCLIENT setting are likely to host SMCs, so an exemption based on this
> setting is logical.
The only exception that comes to mind is an MDA using this as a smart host.
> Connections using authenticated SMTP are also likely to be SMCs and thus
> require such an exemption.
So the equation RELAYCLIENT = MUA still holds.
> I don't know if there's much server to server use of authenticating SMTP,
There shouldn't be any, should there? I only have heard of a quite naive
attempt to send out spam using smtp auth. It was trying a few well-known
names and obvious passwords. (I'm not sure I would call it a "server", though)
> but what with the rise of various anti-spam
> technologies such as SPF I would expect that there would be an increase in
> the use of authenticated SMTP.
Yes, large ISPs are better off if they stop relaying for _local_
addresses w/o auth. Fastweb, for one, is a large Italian ISP who did so.
Those who don't will get on spamhaus or MAPS every now and then, I suppose.
-------------------------------------------------------
This SF.Net email is sponsored by: SourceForge.net Broadband
Sign-up now for SourceForge Broadband and get the fastest
6.0/768 connection for only $19.95/mo for the first 3 months!
http://ads.osdn.com/?ad_id=2562&alloc_id=6184&op=click
_______________________________________________
courier-users mailing list
[EMAIL PROTECTED]
Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
