Sendmail or Postfix?

[Daniel B. Thurman]

I discovered that I have sendmail and postfix on my system,
and while I was unaware that postfix was installed, I had setup
my sendmail configuration and everything seemed to work.

However when I installed ISPConfig, it reconfigured postfix and now
it seems that postfix has taken over sendmail.  Odd, but not really.

Prior to installing ISPConfig and using sendmail instead of postfix,
I had previously reported that clamav and spamassassin in the
sendmail.cf file was reporting errors and no one responded so no
solution was in the works thus disabled.

At this point, my postfix is not properly setup to where it should be,
so this means I have two choices, remove postfix and learn how to set
it up properly or remove sendmail since I already know how it works,
but I cannot have both of these running as it will conflict with each other.

So my question is:

Which of the two Email systems are the most secure, that most people
use and trust, has better control over intrusion and has good AntiSpam
and AntiVirus support?

Thanks!

No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.17.2/1184 - Release Date: 12/14/2007 11:29 AM