GMail overall has a nice spam filter. You can leverage the GMail spam filtering capability even for your corporate emails without paying a dime.

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First you should learn how to create a self-signed certificate using OpenSSL (free). After that it is a simple matter of copying the files to appropriate location and enabling dovecot to use SSL authentication. Let's look at the details.

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I faced a vexing problem with the otherwise excellent Mozilla Thunderbird email client. I was unable to forward emails to another account using the rules in Message Filters. I can normally forward emails. I can also execute other actions in the message filters except forwarding. It fails with a simple error message: "Sending of message failed". The simple solution lies in understanding the design of email accounts & message filters in Thunderbird, as described below in details.

BTW: At one point before solving this problem I even thought about switching to Evolution. And I am not alone. Several people posted the same problem on Mozilla forum without getting any solution.
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eBox platform provides a mini-debian installation along with its modules to allow you to provide and manage network services on your corporate network. The key capabilities includes support for multiple external network interfaces with load balancing, traffic shaping, transparent proxy, firewall, content filters, DNS (domain name server), NTP (time server), mail server, Jabber Instant Messaging server, SAMBA for file sharing, DHCP and more. In short it promise to be a one-stop solution for all network services needs for small businesses. Particularly I was interested in load balancing between multiple ADSL providers and traffic shaping capabilities. Here are my experiences with eBox platform.

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