How to SMTP (Email) Server Fedora 6?

[Les Mikesell]

James Wilkinson wrote:

> These days, Postfix supports the sendmail milter interface. It always
> has run under different user IDs for security. And it has long had its
> own ways of tying in antivirus and spam scanning.

Do you know if it can run MimeDefang?  This is probably the most 
efficient and versatile one around because it wraps all the steps you 
might want to do under control of a small snippet of user-provided perl 
and it lets sendmail reconnect for each phase so the slow steps like 
spamasassin scanning don't tie up processes that can be doing many fast 
operations like validating recipients.  There are some sendmail-specific 
things about it, like the way it knows if the connection is 
authenticated or using ssl.  I'd be surprised if postfix duplicated 
that, but it might not be too hard to convert.

If you don't use an approach like MimeDefang's, you generally end up 
having to make a choice between starting a process for each message 
(slow and inefficient), or tying a large scanning process to each of the 
  processes that handles the smtp conversation (limiting the number you 
can run), or batching things and losing the ability to reject in 
realtime during the smtp conversation based on the milter results.


-- 
  Les Mikesell
    lesmikesell at gmail.com