Underscores in some directory user, group names (Postfix MacPort example)

[Tabitha McNerney]

Hello all --

I just installed the current version of the Postfix port (version 2.4.6) on
a Leopard Server system.

After the install, I noticed a username and group name of "_postfix" and
"_postdrop" respectively, as in:

drwx--x---  2 _postfix  _postdrop  102 Jan  4 23:06 public/
drwx-wx---  2 _postfix  _postdrop  102 Jan  4 23:06 maildrop/

This differs from previous Postfix port installations (UID 27 was "postfix"
not "_postfix"). This isn't really a MacPorts specific issue but I'm
wondering if anyone knows why Apple changed their naming schema on Leopard,
for short names such as:

from "postfix" to "_postfix"

?

I wonder if this has something to do with becoming fully UNIX compliant?
POSIX?

Mr. Jordan Hubbard, can you offer some wisdom and perspective on this
subject?

Thank you,

T.M.
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