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I've tried the UebiMiau, although it's half decent it doesn't seem too secure.
Any way by webmail what do you want it to do, offer you members a way for them to collect there mail from there current ISP if so then it's webmail2 you need, although my last attemps with XOOPS 2.0.* on this module wasn't good seemed much of the coding was broken when upgraded from 1.3.* to 2.0.*
If you want a mail system that works with your own mail server then you need SQMail found at:
SQMailIf your wanting a mail script to offer your own mail service there is none yet that are xoopsed, there are many out there that are not ported one is
http://hivemail.com/ but costs something like $180 so it's not open source, there is a free one @
http://www.b1g.de but you must keep all copyright to them on it, although it appears you can pay to remove it.
Also I seem to remember draven mentioning something about porting B1G to xoops..........
Hope this is of some help.