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Postfix is delivering mail to ~vmail/user/new directories with owner vmail:vmail but permissions masked to 700 (i.e. not group readable.) I need the mailfiles to be created group readable so that other apps in the vmail group can read the mailbox directly. How can I configure these permissions?

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The permissions are not configurable, I'm afraid. They're hardcoded in Postfix.

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Could use ACLs to add additional allowed read permissions? – morgant May 9 '12 at 14:58
For reference, here the lines where postfix hardcoded its permission – masegaloeh Feb 17 '15 at 9:45

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