Which MTA?

[Ken Chew <rekcah@altmedia.com.sg>]

Hi,

I am looking into setting up email accounts for some of our assosciate
companies as well as clients. They will just be using pop3 to retrive
their email, no access to the server via telnet, ftp or whatever?

I understand that there are a number of MTA, snedmail, smail, qmail etc.
Which of these is good for this task? I know different people have
different perference, but I would like to hear opinions.

Also would it be possible to create email account without actuall adding
user account on the system. Currently what we do is 'adduser' for every
user account. Is this necessary?

Thanks!