Jason Tower wrote:
in my experience postfix's more modular nature means that additional functionality can be added on relatively easily. for example, postfix 2.1 includes the "verify" feature which enables it to see if a message is deliverable *before* the smtp data is accepted - if not, it returns a 550 to the sender. no bounces, nothing gets queued. this is incredibly useful when using postfix as a gateway, often in conjunction with amavis/spamassassin/clamav/etc.
jason
Just to throw more information on the fire, erm... umm... anyway...
The verify feature (straight from the man page):
Venema is often overly-cautious, especially with new features, and it may not be so bad after all. Personally, I'm interested in playing with the feature, and I've been setting up a test box earlier today for precisely that purpose. But you have to admit, the warning is a bit dire. :)*BUGS* The address verification service is suitable only for sites that handle a low mail volume. Verification probes add additional traffic to the mail queue and perform poorly under high load. Servers may blacklist sites that probe excessively, or that probe excessively for non-exis- tent recipient addresses.
If the persistent database ever gets corrupted then the world comes to an end and human intervention is needed. This violates a basic Postfix principle.
But again, on the flip side, have you tried using Sendmail to query a mysql database for it's alias entries? Don't. :) Stick with Postfix for tasks such as that. It's easy to setup, and works remarkably well. The only catch being it does open one database connection for every query, so it's not the world's most efficient implementation, but mysql and the mysql client libraries are fast enough that it doesn't really matter. Just note that in large installations you have to kick your max_connections for mysqld (700 or so should be fine), os file descriptors, and a few other things through the roof. :)
Aaron S. Joyner -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/ TriLUG PGP Keyring : http://trilug.org/~chrish/trilug.asc
