[Mailman-Users] mail-gid for Postfix install

[Ki Song]

When installing mailman (using Postfix as the mail server), what should be
the mail-gid option? I'm looking at the main.cf file for postfix and the
setgid-group = postdrop

So, does that mean that when I run the install for mailman, I should set the
following option:

--with-mail-gid=postdrop


Is that correct? If not, where do I find out what the main-gid should be?

Regards,
Ki