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mailbox corruption

mailbox corruption

Since my ISP is never good at troubleshooting real problems, I'm trying to investigate on my own.  They are using Qmail and I am receiving multiple copies of messages that were deleted and purged from the server months ago.  I am certain (and the ISP has confirmed) that the mailbox is being emptied and the deleted items purged.  These messages have not been "on the server" for months.  I suspect some sort of mailbox corruption, but I am not familiar with how Qmail works.  

The problem is easy to reproduce, but it takes time to do so.  If I set a POP client to download from the mailbox every 5 minutes, within 12 hours I will download a batch of messages that are from about 10 months ago (sometimes in that 12 hours, I'll get 5+ copies of the messages).  I can reproduce this on any PC, any OS, any Client (and yes, on clients that have never before logged into the mailbox).  Additionally, I can get the messages to show up in the ISP's Horde web client but I have to be watching it because on the next refresh of the mailbox, they are gone.  It seems like the client, web or POP, has to hit the mailbox at just the right time to get the messages.  

Does Qmail use a mailbox or inbox file that can be deleted if corrupted and then recreated?

RE: mailbox corruption

By default, qmail will use mbox.  

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