If I upgrade to 10.5.2 is it going to mess up my mail

At the moment my mail server seems to be working well with my primary and virtual domains. Being I have it setup with the WGM and Postfix files because virtual users is broken in the current version, if I update to 10.5.2, is that going to mess up my mail system? Will I need to change things after the update or do things differently? Any info would be great. I just don't want to update something and then find out I have a lot of work to do after the update.

You're running a server, and you're asking good questions.
Downtime can be painful, as you've almost certainly learned.
But as for your question, I'm not certain there's anything I'd accept as proof other than a local test. Environments can and do differ, and triggers can be subtle. Your upgrade mileage may vary, after all, depending on many factors.
If you don't have a "scratch" environment where you can prototype the upgrade, make a backup before the upgrade (to allow you a path back), then perform the upgrade and test it. Then (once you're satisfied) turn the users loose on the box.
And even with a scratch environment, I'd still suggest the backup be made.
If you're running critical operations, you may well want a second (or more) mail server around. This for upgrades, and as a fallback should an upgrade stuff something up. (Past outages can often be used as justification for the added hardware and licenses for testing future upgrades -- which is probably the wrong way 'round -- but that's how some organizations work.)
I do know that 10.5.2 "sat on" at least one iCal library on a Mac OS X client. As for what else might have gone off the rails, I haven't seen anything (else) yet, but I've not worked my way up to a server upgrade yet. I usually try several client upgrades first.

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http://i1224.photobucket.com/albums/ee374/Diavonex/491f4b34c45018abef609c832b0f2 56a_zps0d1c18e7.jpg
Message was edited by: Diavonex

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Hi,
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If I upgrade to 10.5.2 is it going to mess up my mail

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