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

[Igor Brezac]

I am including cyrus-devel to this discussion:

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

Cool!

> - What would the map name be?  cyrus?

I would make this a param setting.  You can default to 'cyrus', but I
imagine most people will use virtuser.  (This is a default mapname for
virtual user map)

> envision different types of maps that this daemon would have to support?

Possibly: access, mailer and other maps that sendmail might need.
VirtHosts (list of domains for which sendmail accepts mail) class may be
very useful.

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

You need to process whatever the protocol passes to the server.  A
question might be, how is cyrus going to respond when +detail is not
available but the root mbox is?  I see other strange scenarions here.
Again, this can be controlled with config parameters.

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

I would say no.  If the public box does not exist, answer FAIL.

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

Check http://www.ypass.net/~igor/op.html and search for 'The socket map
uses a simple'.  This will give you glory details.

-- 
Igor