e-mail server farm question

[Iantcho Vassilev]

> Not really, we have a large system which required little coding except
> for script tools.
>
> We have two FreeBSD servers as public gateways running Sendmail +
> Milter-Ahead + MailScanner. These 'gateways' scan mail for viruses and
> then forward the delivery on to three toasters which are FreeBSD servers
> running qmail + vpopmail + Spamd + SquirrelMail.


Why you have chosed sendmail on the "gateways"?
What are the advangtages..i think it is not the speed?