Re: [AMaViS-user] Hints, tips and questions..

Anders,

> I'm about to set up a completely new mail server, and I have some
> questions.. My old server is running ancient versions of everything, now I
> go for Amavis-new 2.1.2, Postfix 2.1.5, SpamAssassin 3.0 and some other
> stuff.
>
> So, on to the questions:

> 1. What are the pros and cons on SMTP versus LMTP delivery?

The http://www.ijs.si/software/amavisd/README.postfix.txt says:

Postfix can be told to feed mail to amavisd via LMTP protocol instead
of SMTP. This is possible since Postfix 2.0 and amavisd-new-20021116,
although LMTP longer has much of an advantage over SMTP since Postfix 2.2.

LMTP brings per-recipient status responses and also a multi-transaction
session capability, the later of which the Postfix service smtp before
cca. 2004-08 lacked. For newer versions of Postfix with "connection cache"
capability (previously known as "session caching"), i.e. the Postfix 2.2
and the snapshots since cca. 2004-08, staying with a more modern design
of smtp (vs. the older lmtp) is probably better choice for the moment.

A LMTP advantage in its per-recipient status responses is most useful
if amavisd-new is configured to D_REJECT mail instead of D_BOUNCE it,
but rejecting mail leads to backscatter generated by MTA and is not a
recommended setting in a Postfix after-queue and other dual-MTA settings.
With more common settings (D_BOUNCE, D_DISCARD or D_PASS) the LMTP may
offer more informative MTA log entries, although it is not clear if
it outweights the more modern design of Postfix SMTP client.

> 2. How do I set up SQL Lookups, README.lookup just made me confused.

Sorry, I can't offer anything better than README.lookups for the moment.
The SQL examples there can by directly cut/pasted into a mysql command
in interactive mode.

> 3. Is DSPAM any good for an ISP-like setup?

Don't know, others have more experience than me. I used it for a few weeks
until it turned out to be too slow compared with all the rest. This was
with dspam database on bdb, not on SQL, which probably does better.

> The system will host mail services for 50+ domains, and should be centrally
> administered, I don't want any users to make a mess in configs.

For SQL administration look into Maia Mailguard or other links in the
"Contributed and related software" section of the web page.

Mark


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