On Wednesday 31 December 1969 04:00 pm, you wrote:
There is a package called amavisd-new which allows you to set up an anti-virus scanner and spamassassin as an extension of postfix. This can process email before it's delivered from postfix to where ever (procmail/lmtp/...)
This simplifies some things in that the mail, as delivered to the MDA has already been "bagged and tagged" as spam, virus, good/bad and you can use procmail/sieve equally effectively for filtering from there.
here I dont have 60 employies but I do generate about 1200 emials a day. I use Postfix with maildrop wich is much easier to use than procmail and at least if not more powerful. I have maildrop do local delivery and then use dovecot in secure mode with imap to get the emails. Even with imap dovecot is blindingly fast. Folders with around 10000 emails refresh in under a minute with about 600 or so at a time that are new.
The nice thing about this is that with maildrop I can easily filter spam whit spamassassin. At about 600 spam emails a day it misses about 1% I have only had about 2 or 3 false positives for about 30000 or 40000 spam emails. Thats a very good ratio.
I also filter virii with anomy saitizer. It works very simply and never needs any definition update files. You can set the config file to simply not allow certain kinds of atachments. It is 100% secure 100% of the time. It can easily be set to allow some kinds of atachments like zip or whatever. This is not so bad as any user that knows enough to unzip a file is a little more advanced and hopefully knows a little bit more about their system. Anomy also defangs bad html in some emails to protect from that kind of atack.
I then have maildrop filter the spam out and virii out into thier own folders on the imap server. The files can still be accessed but for hte most part you dont need to.
The reason i use imap is so that i can check the virii and spam and see if it is all legit.
Pop would be very easy to set up and run on this also allowing the user to easily download anything that is not spam or virii which the admin could later check out and either transfer for the user and simply delete.
If it is needed maildrop could also be setup to make spamassassin autolearn new spam or ham.
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