Hi, I am delivering via LMTP from Sendmail 8.11.4 to Cyrus v2.0.14-NAMESPACE-r3 using the local socket. Deliver is working most of the time, but I am noticing errors: # mailq f5T4m6426721 1335 Fri Jun 29 14:48 <[EMAIL PROTECTED]> (<[EMAIL PROTECTED]>... reply: read error from localhost) f622ED205182 1296712 Jul 2 12:14 <[EMAIL PROTECTED]> (Deferred: Connection reset by localhost If I instruct sendmail to deliver this, I get: # sendmail -v -qIf620Zoc01487 Running /var/spool/mqueue/f620Zoc01487 (sequence 1 of 1) <[EMAIL PROTECTED]>... Connecting to /var/imap/socket/lmtp via cyrus... 220 yyy.xxx.com.au LMTP Cyrus v2.0.14-NAMESPACE-r3 ready >>> LHLO xxx.tpgi.com.au 250-yyy.xxx.com.au 250-IGNOREQUOTA 250-8BITMIME 250-ENHANCEDSTATUSCODES 250-AUTH PLAIN LOGIN EXTERNAL 250 PIPELINING >>> MAIL From:<[EMAIL PROTECTED]> [EMAIL PROTECTED] >>> QUIT <[EMAIL PROTECTED]>... Deferred: Connection reset by localhost Closing connection to localhost ..only a few seconds later, I did it again and it worked: # sendmail -v -qIf620Zoc01487 Running /var/spool/mqueue/f620Zoc01487 (sequence 1 of 1) <[EMAIL PROTECTED]>... Connecting to /var/imap/socket/lmtp via cyrus... 220 yyy.xxx.com.au LMTP Cyrus v2.0.14-NAMESPACE-r3 ready >>> LHLO yyy.xxx.com.au 250-yyy.xxx.com.au 250-IGNOREQUOTA 250-8BITMIME 250-ENHANCEDSTATUSCODES 250-AUTH PLAIN LOGIN EXTERNAL 250 PIPELINING >>> MAIL From:<[EMAIL PROTECTED]> [EMAIL PROTECTED] 250 2.1.0 ok >>> RCPT To:<tyree78> 250 2.1.5 ok >>> DATA 354 go ahead >>> . 250 2.1.5 Ok <[EMAIL PROTECTED]>... Sent Closing connection to localhost >>> QUIT 221 2.0.0 bye Is there some problem with delivering multiple messages at the same time. Does increasing the preforking for the LMTP local socket file make sense? Should I use delivery to the local LMTP port via TCP and inclease the preforking there? At the moment I am doign queue jobs every minute in the hope of flushing these messages though. My .mc file looks like this: MAILER(smtp)dnl MAILER(local)dnl define(`confLOCAL_MAILER',`cyrus')dnl MAILER_DEFINITIONS Mcyrus, P=[IPC], F=lsDFMnqA@/:|SmXz, E=\r\n, S=EnvFromL, R=EnvToL/HdrToL, T=DNS/RFC822/X-Unix, A=FILE /var/imap/socket/lmtp LOCAL_RULE_0 Rbb + $+ < @ $=w . > $#cyrus $: + $1 Kind regards, Stuart