sendmail-8.12.6+cyrus-imapd-2.0.17: check presence of the cyrus mailbox during establishing SMTP connection

Ken Murchison ken at
Wed Nov 5 16:22:55 EST 2003

Igor Brezac wrote:

> On Wed, 5 Nov 2003, Andrzej Filip wrote:
>>Igor Brezac wrote:
>>>On Wed, 5 Nov 2003, Andrzej Filip wrote:
>>>>Igor Brezac wrote:
>>>>>On Tue, 4 Nov 2003, Andrzej Filip wrote:
>>>>>>I also thought that "virtusertable like" solutions [periodic dump of cyrus
>>>>>>mailbox data into existing sendmail databases] are the best but most people
>>>>>>had wanted "real time" synchronization.
>>>>>True, this would be a long way of doing things.  Shell/perl/web/etc
>>>>>scripts can automate the process of managing cyrus mboxlist and sendmail
>>>>>maps simultaneously thus keeping the two databases in sync "real time".
>>>>IMHO making cyrus daemon servicing also simple tcp based "map protocol" (to be
>>>>introduced in sendmail 8.13) is a better way. I bet it :)
>>>In my opinion it is better if it does more than just the mbox
>>>verification.  I'd like to see the quota check as well.
>>The current protocol specification allows only passing one parameter (key)
>>queries e.g. mailbox name. I am going to try make it capable to pass multiple
>>parameters queries e.g. mailbox name, "SIZE=" parameter.
>>It would be nice to allow interaction with sieve rules at "RCPT TO:" stage.
>>[it seems to be possible from sendmail's perspective]
>>>I am not sure if
>>>the "map protocol" allows for multiple return codes rather than just
>>>yes/no type answer.  Then there is the performance consideration, I would
>>>hope that the "map protocol" allows for a "persistent" tcp connection.
>>* return codes
>>The status indicator is one of the following upper case words:
>>	OK       the key was found, result contains the looked up value
>>	NOTFOUND the key was not found, the result is empty
>>	TEMP     a temporary failure occured
>>	TIMEOUT  a timeout occured on the server side
>>	PERM     a permanent failure occured
>>* current "map protocol" uses TCP connections
>>(one tcp connection per one sendmail process)
>>I hope UDP (connectionless) transport will be supported too.
> PERM/TEMP can be used for 'over quota' situations and it should be
> parameter driven (similar to the way lmtpd deals with over quota).

I could probably write this service in a couple hours given its 
simplicity, but I have a few of questions:

- What would the map name be?  cyrus?  Would it ever change?  Can people 
envision different types of maps that this daemon would have to support?

- Is the key always the RCPT TO address, including +detail info, or does 
Sendmail strip this before doing the map lookup?

- How do we handle lookups of public mailboxes?  Always return OK?

- I assume that the "mapping" would be a noop, we just spit out the 
input if the user exists and is under quota.

Kenneth Murchison     Oceana Matrix Ltd.
Software Engineer     21 Princeton Place
716-662-8973 x26      Orchard Park, NY 14127
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