Setting up Cyrus IMAPd for Sendmail (Debian)
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[This is user-contributed, unverified information]

First, do *not* use the old cyrus*.m4 macros, they won't work well. The one
you can use is cyrusv2.m4. There are many methods of connecting Cyrus to
sendmail, and replacing the local mailer with Cyrus lmtpd is just one of
them.

Andrzej Filip <anfi@priv.onet.pl> says:
http://anfi.homeunix.net/sendmail/localNalias.html
   Cyrus Aliases
   It allows to use user@CYRUS redirections in virtusertable,
   aliases and .forward file e.g.  I use the following ~anfi/.forward:
   anfi@CYRUS

http://anfi.homeunix.net/sendmail/localtab.html
   Local Table

http://anfi.homeunix.net/sendmail/rtcyrus2.html
   Real Time Cyrus Integration
   It allows sendmail to check presence of cyrus mailbox in real time, 
   sendmail rejects message to non existing cyrus mailboxes in reply to 
   "RCPT TO:"


I am not sure how well these will work with sieve.  The one report I have
for Cyrus + sendmail with working sieve is:

"cyrus/sieve vacation seems to work only if you integrate cyrus via
cyrusv2.m4 into sendmail (8.12.3-4)."

Sample sendmail.mc that seems to work:
--------
[...]
dnl define BIND_OPTS',`-DNSRCH -DEFNAMES')dnl
define(`confLOCAL_MAILER', `cyrusv2')dnl
MAILER(`local')dnl
MAILER(`smtp')dnl
MAILER(`cyrusv2')dnl
dnl MODIFY_MAILER_FLAGS(`cyrus',`+w')dnl

LOCAL_RULE_0
Rbb + $+ < @ $=w . >    $#cyrusbb $: $1
[...]
--------

Here's a sieve test script you can try. Change it as needed for your
site:

require "fileinto";
require "vacation";
require "envelope";

if header :contains "subject" "vactest" {
         vacation :days 7 :addresses ["me@home.de"] "vactest!";
}


Pierre Gambarotto <pierre.gambarotto@enseeiht.fr> says:
The minimum in order to make it work with sendmail is:

define(`confLOCAL_MAILER', `cyrusv2')
define(`CYRUSV2_MAILER_ARGS',`FILE /var/run/cyrus/socket/lmtp')
MAILER(`cyrusv2')

The CYRUSV2_MAILER_ARGS is the key.