On 07/29/2010 01:15 PM, Neal Morgan wrote:
Thanks for the response Chris.

I am using "whatever Debian came with!"  :-)  I believe it is mbox: the
files are /var/mail/[username]

I am a little surprised to hear multiple connections to the same mailbox
is unsupported.  I have had plenty of this over the years (most in the
form of Outlook or Mac Mail on a desktop and blackberry or other phone
at the same time) and it has been working fine.  The only issue we've
run into is users employing POP on their desktop at the same time as
IMAP on their phone.  That causes the same kind of corruption.  We have
discouraged this and suggested they switch to using IMAP in both places.

This issue with the iPhones appeared here in the last 6 months when we
upgraded this box - moving away from a custom UW-imap build in favor of
the package maintainers version.  I suppose I could go back to building
it myself - it was just a hassle to figure out how to get c-client to
install correctly.

Yeah, it's an unsupported configuration. I was surprised too, years ago, when I was told by someone else that they were using another imap server for this reason. Upon investigation, Mark indicated that it was the mbox format, not the daemon in general, that had this limitation. And it works fine as long as you close one mail client before opening another. It's just the possibility of numerous simultanious updates that isn't handled "well".

So, I switched to mbx. A little more of a pain to deliver mail, as it's not the MTA's native format, but the tmail program that comes with the uw-imap tools works around that. I just deliver to an mbx format INBOX in each users home directory. Or, for myself (ie, "some users"), run procmail on incoming mail including spamfiltering, and use dmail to deliver it to the right mailbox of mine.

  Good luck with whatever you choose to do.

                                - Chris
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