What is a "postfix"-volume?

hello
when connecting as registered user from my PB via afp to my G5, i can choose between three volumes to mount: the two users (senex, support) and a volume called "postfix". my two HD aren't choosable, which i don't understand, but the more disturbing thing is the postfix-volume. if i connect to it, it says, i don't have sufficient rights etc., and a FOLDER with one-way is shown.
what is this, where does it come from and how can i get rid of it? i searched spotlight for postfix, deleteted some files and it still shows. also i cannot find this folder on my g5 that i connect to from my PB.
thank you for your help!
regards
senex

I have the exact same problem. When I connect to my server I to see a shared volume named postfix.
Some details:
My server is running Mac OS X 10.4.8 (client not server version) with all updates.
There is 4 users registered on the server. 3 are normal and 1 has admin priv.
It is configured using a shareware named Sharepoint (latest version).
The settings are such that the admin user gets treated as a normal user when connecting to the server on afp://myserver.local
Only the admin user can see the postfix volume. Otherwise all users see the same volumes.
I used to have the admin user setting to see the whole disc but thought it to be insecure so I changed it recently. Obviously the admin user wouldn't have noticed the postfix volume before I changed that setting. So the postfix volume could have been there for a long time.
If I mount the volume it will mount but is inaccessible. The volume has owner: postfix read&write; group: postdrop no access; others no access;
The folder /var/spool/postfix/public/ is the only folder i can find with the same Owner and permissions. Can someone explain why this is shared? And if its supposed to? And does it have the right settings?
The only other folder with the group: postdrop is /var/spool/postfix/maildrop/ but it has group: postdrop write only;
The server is not supposed to run a mailserver and has never been configured to do so. However in the mail.log it clearly shows that the postfix server has been running for some hours (or days) sometimes but most of the time the daily cron job states that the mailsystem is down. Last time it run it shut down after trying to handle a to large file on request by the admin user. Which is strange since I'm the only one who can use that account and I didn't do anything.
Someone who can explain?
flowerboy
iMac G5 Mac OS X (10.4.8)
iMac G5 Mac OS X (10.4.8)
iMac G5

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