It already is, see output of id:
[r...@vmfc12 ~]# id mike4uid=516(mike4) gid=516(mike4)
Date: Fri, 4 Dec 2009 16:36:46 +0300
Subject: Re: [vchkpw] vdeliver perimission denied for vadddomain -u
I'm not sure how it will affect security, but perhaps you could make mike4 and
other users who need access to vpopmail.mysql members of vchkpw group?
In linux it should be "usermod -a -G vchkpw mike4"
And you can use "groups mike4" command to see in which groups mike4 is.
Use Hotmail to send and receive mail from your different email accounts