LMTP Problem with murder

[Marc-Andre Gaudreau]

Hi,

We have a problem with lmtp delivery on our Murder setup (cyrus-imap 
2.1.14, cyrus-sasl 2.1.13 on redhat 7.3).  We get a bunch of these 
messages every day on both our fontends:

Sep  5 16:05:35 frontend1 lmtpproxyd[13332]: lmtpengine do_auth: 
sasl_client_start failed (SASL(-4): no mechanism available: No worthy 
mechs found)

And the corresponding message from sendmail:

Sep  5 16:05:35 frontend1 sendmail[18069]: h85K5Zw18067: 
to=<xxxxxxxx at somedomain>, delay=00:00:00, xdelay=00:00:00, mailer=cyrus, 
pri=125620, relay=localhost, dsn=4.3.0, stat=Deferred: Connection reset 
by localhost

In general, mail delivery is working fine.  But 10-20 times a day, we 
get these errors and the message gets queued up for a while before it 
finally reaches its destination.  The problem exists for users on both 
our backends.  We use DIGEST-MD5 to authenticate between lmtpproxyd on 
the frontend and lmtpd on the backend.

Any help would be greatly appreciated.