Sammenligning m. andre MTA'er
- (fra Postfix' mailingliste)
sendmail exim smail zmailer qmail postfix
DFSG license Y Y Y Y N Y
sendmail compat Y Y Y N N Y
easy to configure N Y N N  Y
regexp in config files N N N N N Y
secure design N N N N Y Y
secure in practice N    Y Y
fast N N N Y Y Y
copes with heavy load N N N Y Y Y
 some say yes, some say no. i think qmail is clumsy to configure.
it's certainly not as easy as either postfix or exim.
 unknown. AFAIK, exim hasn't had any major security incidents.
 unknown. probably not. there have been problems in the past.
 i don't know enough about zmailer to comment, i only trialled it
for a few days.