Searching for a Solaris Mail Server?

pipeb0mb asks: "The company I work for is looking to update our mail server. Currently, the hardware is a Sun Enterprise 450. It was to be used with iPlanet 5.01 (the bastard child of iPlanet, Sun 'SIMS' and Netscape Messaging Server). Unfortunately, iPlanet just will not run...to be more precise, it won't even INSTALL! iPlanet support is less than stellar. In the wake of this discovery, the mail service being utilized is SIMS 3.5 on a 250. However, it is old, and we are beyond capacity on users (we're up to 8000). To make it even more complicated, we need some additional features for our server?" The additional feature list isn't all that long, and it's fairly reasonble. Hit the link to check it out and feel free to offer suggestions, as always.

"Here's what our server needs to support:

• http interface (for webmail)
• IMAP
• POP3
• SMTP
• Relay filtering, both on the user level and the server level
• content filtering (optional)
• Web based management

and, most important of all

• multiple domain ready.

Again, it must be a Solaris compatible...be it 2.6 or 8, preferably 8. So Slashdot, whaddya think? Any ideas?"