[Dovecot] Mail lost - maybe a bug???

Hello everybody

I'm struggling against what seems a really serious trouble: sometimes
mail get lost

I did all the possible checks, but they seems really lost - I know is
absurd, but it seems so

it has been noticed by two users on my server: intially I tought that
was their mistake (mail deleted, mail into spam, ecc), but it wasn't

I deeply checked mail logs, and it seems that mail are delivered (the
path is postfix->amavis->dovecotlda) - log files says that messages
are delivered, but sometimes we lost a message.

I also tried to get into the Maildir and grep the subject of the lost
email: if it was addressed to more recipients I'm able to get it on
some of them, but not to all (look at the example below)

I hope I have clearly explained everything, otherwise let me
knowmydomain

now an extract from the log file:

to=oil@mydomain.ch proto=ESMTP helo= Oct 27 11:20:31 srv001 postfix/cleanup[25157]: CE0B74E4A9F: message- id=e9447410-51fe-45ff-b624-197840b9a862@usstlz-pinfez02.emrsn.org Oct 27 11:20:31 srv001 postfix/qmgr[11827]: CE0B74E4A9F: from= out bytes=632/34319 Oct 27 11:20:34 srv001 postfix/smtpd[25162]: connect from
localhost.localdomain[127.0.0.1] Oct 27 11:20:34 srv001 postfix/smtpd[25162]: B16284E4AA2:
client=localhost.localdomain[127.0.0.1] Oct 27 11:20:34 srv001 postfix/cleanup[25157]: B16284E4AA2: message- id=e9447410-51fe-45ff-b624-197840b9a862@usstlz-pinfez02.emrsn.org Oct 27 11:20:34 srv001 postfix/qmgr[11827]: B16284E4AA2: from= [144.191.128.17] [155.177.20.144] Emerson.News@emersonprocess.com ->
user1@mydomain.local,user2@mydomain.local,user3@mydomain.local,
Message-ID: B16284E4AA2, 3293 ms Oct 27 11:20:34 srv001 postfix/lmtp[25158]: CE0B74E4A9F: to=oil@mydomain.ch, relay=127.0.0.1[127.0.0.1]:10024,
delay=4.2, delays=0.95/0.01/0.01/3.3, dsn=2.0.0, status=sent (250
2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as B16284E4AA2) Oct 27 11:20:34 srv001 postfix/lmtp[25158]: CE0B74E4A9F: to=oil@mydomain.ch, relay=127.0.0.1[127.0.0.1]:10024,
delay=4.2, delays=0.95/0.01/0.01/3.3, dsn=2.0.0, status=sent (250
2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as B16284E4AA2) Oct 27 11:20:34 srv001 postfix/lmtp[25158]: CE0B74E4A9F: to=oil@mydomain.ch, relay=127.0.0.1[127.0.0.1]:10024,
delay=4.2, delays=0.95/0.01/0.01/3.3, dsn=2.0.0, status=sent (250
2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as B16284E4AA2) Oct 27 11:20:34 srv001 postfix/qmgr[11827]: CE0B74E4A9F: removed Oct 27 11:20:34 srv001 dovecot: lda(user1): msgid= status=sent (delivered via dovecot service) Oct 27 11:20:34 srv001 dovecot: lda(user2): msgid= status=sent (delivered via dovecot service) Oct 27 11:20:34 srv001 dovecot: lda(user3): msgid= status=sent (delivered via dovecot service) Oct 27 11:20:34 srv001 postfix/qmgr[11827]: B16284E4AA2: removed Oct 27 11:20:36 srv001 postfix/smtpd[24562]: disconnect from usstlz-

Oct 27 11:20:29 srv001 postfix/smtpd[24562]: connect from usstlz- psecap06.emerson.com[144.191.128.17] Oct 27 11:20:30 srv001 postfix/smtpd[24562]: CE0B74E4A9F:
client=usstlz-psecap06.emerson.com[144.191.128.17] Oct 27 11:20:31 srv001 postfix/cleanup[25157]: CE0B74E4A9F: warning:
header Subject: =?utf-8?B? RW1lcnNvbiBHbG9iYWwgVXNlcnMgRXhjaGFuZ2UgMjAxMiBpbiBEw7xzc2VsZG9yZiA6IFJlaWNoZW4gU2llIGpldHp0IElocmUgUHLDpHNlbnRhdGlvbmVuIGVpbg ==?= from usstlz-psecap06.emerson.com[144.191.128.17]; from=

as you can see there was a message for oil@mydomain.ch (I obviously
changed the domain for privacy) - logs says that all the three users
got the email, but the third user didn't.

I do not know why and when it happens, but seldom we have this issue

maybe is there some kind of bug in the maildrop version I use? by the
way, I had this issue also before installing amavisd-new

now some infos:

CentOS 5.3 postfix-2.3.3-2.1.el5_2 amavisd-new-2.6.6-1.el5.rf dovecot-2.0.11-1_126 dovecot-managesieve-0.2.2-15 dovecot-pigeonhole-0.2.2-15

users are on a Kerberized OpenLDAP

please help me because this is really driving me crazy -

don't leave me alone, please

Marco Carcano