dovecot - Jan 2013 - Overloading IMAP Server

Hi All,
            I am having an issue with dovecot IMAP reading and writing to one
specific mailbox. I have a check email delivery script that sends out a email
and then logs into dovecot to check if the mailbox that the message has been
delivered to. However, the servers that send these messages send them in bunches
depending on how many postfix spools it is checking. So I could get 60 messages
all being sent to 1 mailbox and then having to read that same mailbox to check
if the message actually got delivered.

I am using postfix as the MTA and dovecot is actually delivering the message to
the mailbox

I am getting a lot of  errors such as the following:

Could not connect to IMAP server
imap failed: IMAP RECEIVE CRITICAL - Could not select INBOX


Any ideas as to what I can tweak in dovecot to allow these messages to be
verified.

Thanks for any information or help you could provide!!

Ken

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On Mon, 21 Jan 2013, Harford, Ken wrote:
>            I am having an issue with dovecot IMAP reading and writing to 
> one specific mailbox. I have a check email delivery script that sends
What's the purpose of the verification:

+ The prompt delivery?

+ The delivery at all?

+ The correct delivery?
> out a email and then logs into dovecot to check if the mailbox that the 
> message has been delivered to. However, the servers that send these 
> messages send them in bunches depending on how many postfix spools it is 
> checking. So I could get 60 messages all being sent to 1 mailbox and 
> then having to read that same mailbox to check if the message actually 
> got delivered.
>
> I am getting a lot of  errors such as the following:
>
> Could not connect to IMAP server
> imap failed: IMAP RECEIVE CRITICAL - Could not select INBOX
Is this an error logged by Dovecot?
> Any ideas as to what I can tweak in dovecot to allow these messages to be
verified.
a)
Wait a bit before logging into the IMAP server and check the messages 
sequentionally, not in parallel. E.g. your script could synchronize itself 
with other parallel instances by a shared lock.

b)
Use mail_log and a script on the mail server monitoring Dovecot logs and 
register delivered message ids and/or recipient. Then figure out a good 
way to probe, if one pariticular message has been seen.
- -or-
make note of message id/recipient on the sender side, somehow push (ssh or 
something) that information on regular basis to the mail server, where a 
script verifies that data.

c) To verify the correct delivery: use some sort of checksumming.

Kind regards,

- -- 
Steffen Kaiser
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