Thanks for the responses.
Here's a brief summary;
Use "aliasadm" command, it will automatically update the NIS+ mail_aliases table
that is used by Sun's sendmail.
There's still some problems with reverse aliasing - Firstname.Lastname@domain -
but I managed to get a workaround - it seem's that the CANON option in
"aliasadm" command doesn't work very well.
If you have some experience with it, please let me known. I'll summarize it as
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