I have (had) a working email environment withe Sendmail 8.13.8 and cyrus-imapd 2.3.7. System is CentOS 5.2
Local mail is not being delivered:
Running /var/spool/mqueue/n352XCtg004074 (sequence 1 of 1)
<email@example.com>... Connecting to /var/imap/socket/lmtp via cyrusv2...
Could not connect to socket /var/imap/socket/lmtp: Connection refused by localhost
<firstname.lastname@example.org>... Deferred: Connection refused by localhost
Apr 5 14:21:28 europa sendmail: n352XCtg004074: to=<email@example.com>, delay=15:48:16, xdelay=00:00:00, mailer=cyrusv2, pri=309 3798, relay=localhost, dsn=4.4.1, stat=Deferred: Connection refused by localhost