My power supply died on Sunday morning, and as much as I wanted it not too, the machine powered off. Doesn't meet any of your above requirements but I'll let it pass this once.
Rob
This bloody uptime thread cursed me. My mail server was up for almost 200 days, when at 6:50pm on Sunday (Fry's closes at 7pm and I'm all out of spare parts) the power supply overheated and died.
Not to be outdone by the hot painful death of the power supply, the CPU fan croaked, followed almost immediately afterwards by the processor.
The machine was first built in 1998 and has been up & around 24/7 since that time. THis is important to note because I learned that 6 years is about how long yur typical bargain-basement CD-ROM drive will last. I was trying to get the drawer to eject so I could boot off of a Gentoo CD, and instead of opening the tray, it spit out the drive belt instead.
It was at this point that I decided to start drinking as much beer as I could possibly find because I knew that I was screwed until Fry's opened.
A six-pack of Pyramid Ale's "Apricot Ale" later, I had a brilliant idea - tear apart my old gaming PC for parts.
This went on until about 8am. I was able to patch together a machine that could boot off of the Gentoo LiveCD and rsync maildirs to another box while building up a replacement mail server.
I'm amazed that this all actually worked in the end.
So, the uptime thread cursed me, big time. :P
On an on-topic note, the mailgate box was spooling up all of the email and once I brought the primary mail server back online, the SA-SQL setup performed flawlessly and most customers had no idea about the mail server outage. :)
BTW, when is the next run of SpamAssassin t-shirts?
-Jonathan "I love beer" Nichols