Ideal mail server: qmail or postfix

[James Godwin]

Hi,

We are building small server solution for our clients which run a number of
services and we are looking at incorporating mail server services.

As a hosting provider we manage their web and email services. Our boxes were
configured with Sendmail and we have had no need to change. No need fixing
something which is not broken. :) basically have not had the time to change.

As our company grew we became more familiar with running BSD and aware of
other alternatives.

I was wondering what mail servers fellow ISP are running. I can't decide
between postfix or qmail.

Any advantages or disadvantages would be greatly appreciated.

Kind regards,

James