What is org.postfix.master and how can I stop it? Do I want to?

Hi All,
I have this going on in console every 10 seconds, endlessly:
18/07/2011 18:20:41          com.apple.launchd[1]          (org.postfix.master[313]) Exited with exit code: 1
18/07/2011 18:20:41          com.apple.launchd[1]          (org.postfix.master) Throttling respawn: Will start in 9 seconds
18/07/2011 18:20:51          com.apple.launchd[1]          (org.postfix.master[314]) Exited with exit code: 1
18/07/2011 18:20:51          com.apple.launchd[1]          (org.postfix.master) Throttling respawn: Will start in 9 seconds
18/07/2011 18:21:01          com.apple.launchd[1]          (org.postfix.master[315]) Exited with exit code: 1
18/07/2011 18:21:01          com.apple.launchd[1]          (org.postfix.master) Throttling respawn: Will start in 9 seconds
18/07/2011 18:21:11          com.apple.launchd[1]          (org.postfix.master[316]) Exited with exit code: 1
18/07/2011 18:21:11          com.apple.launchd[1]          (org.postfix.master) Throttling respawn: Will start in 9 seconds
I don't know why but my instinct says this should not be happening.
Can someone please tell me:
1. do i need this? if so, what is it?
2. if not, how can i stop it?
Thanks!

here you go:
Jul 18 22:24:28 marks-macbook postfix/master[335]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:24:38 marks-macbook postfix/master[336]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:24:48 marks-macbook postfix/master[337]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:24:58 marks-macbook postfix/master[339]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:08 marks-macbook postfix/master[340]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:18 marks-macbook postfix/master[341]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:28 marks-macbook postfix/master[342]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:38 marks-macbook postfix/master[347]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:48 marks-macbook postfix/master[351]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:25:58 marks-macbook postfix/master[354]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:08 marks-macbook postfix/master[355]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:18 marks-macbook postfix/master[357]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:28 marks-macbook postfix/master[358]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:38 marks-macbook postfix/master[361]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:48 marks-macbook postfix/master[363]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:26:58 marks-macbook postfix/master[364]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:27:08 marks-macbook postfix/master[366]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
Jul 18 22:27:18 marks-macbook postfix/master[367]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied
I guess the gist of it is, somehow my user does not have permission to open some file. Strange since I own the thing...
Any ideas?

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What is org.postfix.master and how can I stop it? Do I want to?

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