Re: [courier-users] Corrupted Mailbox Problems (456,

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Charles Uchu Strader writes:

> Review of issue and fix.
>
> 1) Incoming email to a valid address (realuser@planet-save.com) was all
> getting temporary errors such as below
>
> Jun 21 10:38:27 emailserver1 courierlocal: maildrop: Unable to create a
> dot-lock.
> Jun 21 10:40:38 emailserver1 courieresmtpd: 456 Address temporary
> unavailable.
>
> 2) All permissions, quota, etc were fine for this mailbox and logging in
> via POP3 or IMAP was fine
>
> 3) Removed the mailbox from the server entirely, added it back in and
> the problem still existed.

See http://www.courier-mta.org/install.html#backscatter

Please read this _entire_ section of INSTALL. Do not stop after the first
two paragraphs.

> Questions:
>
> So what could have caused the original problem?
>
> Was the mailq for this user corrupted somehow? What are possibilities
> for causing corruption?

No. The mail queue was not corrupted.

> Are there any tools for situations like this to purge any information in
> the spool directories besides cancelmsg? I know it would not follow RFC
> for delivery failure notification, but that method did not work in this
> situation.
>
> What do the /track/ files do?

Implement backscatter suppression. See the 'courier clear' command in the
courier(8) man page for the correct procedure to resolve this.


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