Question about murder and lmtp

[Eero Hänninen]

Hello,

I'm new in murder setup. I got it almost to work but I have question,
is there way to use lmtp as preauthed so that no extra auth required?

Currently, mail-relay host connects to frontend server successfully 
(frontend server running lmtpproxyd with -a option and backend server 
running lmtpd with -a option), but in log appears line:
Mar  7 13:33:10 front02 lmtp[79887]: couldn't authenticate to backend 
server: no mechanism available
Mar  7 13:33:10 front02 lmtp[79887]: USAGE vaike401 user: 0.014101 sys: 
0.000000

And when I do tcpdump between backend and frontend server, there seems 
no auth like actions or something else:

B: 220 back07 Cyrus LMTP Murder v2.4.13 server ready
F: LHLO lmtpproxyd
B: 250-mh7
B: 250-8BITMIME
B: 250-ENHANCEDSTATUSCODES
B: 250-PIPELINING
B: 250-SIZE
B: 250-AUTH EXTERNAL
B: 250 IGNOREQUOTA
F:
B: 421 4.4.1 bye end of file reached

In last frontend server seems send nothing to backend server and 
backend server disconnects after that.
This "nothing" looks like:
13:32:29.375260 IP 10.4.0.43.51977 > 10.4.0.118.2003: Flags [F.], seq 
18, ack 175, win 1026, length 0
         0x0000:  0050 56bf 0072 0050 56bf 00b3 0800 4500  
.PV..r.PV.....E.
         0x0010:  0028 c2a8 4000 4006 637f 0a04 002b 0a04  
.(.. at .@.c....+..
         0x0020:  0076 cb09 07d3 24ef aa55 2c23 0755 5011  
.v....$..U,#.UP.
         0x0030:  0402 14c3 0000                           ......

Best Regards,
Eero