A client of mine is complaining about not receiving certain messages.
Her colleague is also being sent them and receives them just fine. She
insists that they are not being sent to her junk folder and that she has
no filters that might be moving them elsewhere.

I've had a look at the logs and can see that the latest msg appears to
have been successfully sent to both mailboxes. However, I'm not sure how
to correctly interpret the log entries. I'm including the entries below
(removed date/time and indented for legibility) and hope that someone
could be kind enough to clarify what's happening.

I believe the problem does not involve postfix, as pipe appears to be
sending both. It looks to me as if lmtpunix is looking at just the one
address and thinks there's a duplicate. Note the two duplicate_check
lines, both of which reference the julia account. I've sent a test
message and indeed the duplicate_check again referenced only the julia
account again, and admin did not receive it.

The client cannot confirm whether this only happens when a message is
addressed to both of them but thinks that may be the case.

But then pipe appears to send a copy to each mailbox after all. I'm
quite confused.

The mailbox that is NOT receiving the msgs is admin, while julia does
get them.

-- snip --
   postfix/smtpd[26599]: connect from
mail-ob0-f171.google.com[209.85.214.171]
   postfix/smtpd[26599]: setting up TLS connection from
mail-ob0-f171.google.com[209.85.214.171]
   postfix/smtpd[26599]: Anonymous TLS connection established from
mail-ob0-f171.google.com[209.85.214.171]: TLSv1 with cipher RC4-SHA
(128/128 bits)
   postfix/smtpd[26599]: E401F7A25EF:
client=mail-ob0-f171.google.com[209.85.214.171]
   postfix/cleanup[26601]: E401F7A25EF:
message-id=<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...>
   postfix/qmgr[27662]: E401F7A25EF: from=<SENDER@gmai...>, size=2295,
nrcpt=2 (queue active)
   postfix/pipe[26602]: E401F7A25EF: to=<admin@DOMA...>,
relay=spamassassin, delay=1.5, delays=0.23/0/0/1.3, dsn=2.0.0,
status=sent (delivered via spamassassin service)
   postfix/pipe[26602]: E401F7A25EF: to=<julia@DOMA...>,
relay=spamassassin, delay=1.5, delays=0.23/0/0/1.3, dsn=2.0.0,
status=sent (delivered via spamassassin service)
   postfix/qmgr[27662]: E401F7A25EF: removed
   postfix/pickup[26486]: 66E757A25FC: uid=5001 from=<SENDER@gmai...>
   postfix/cleanup[26601]: 66E757A25FC:
message-id=<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...>
   postfix/qmgr[27662]: 66E757A25FC: from=<SENDER@gmai...>, size=2646,
nrcpt=2 (queue active)
   cyrus/master[26609]: about to exec /usr/lib/cyrus/bin/lmtpd
   cyrus/lmtpunix[26609]: executed
   cyrus/lmtpunix[26609]: accepted connection
   cyrus/lmtpunix[26609]: lmtp connection preauth'd as postman
   cyrus/lmtpunix[26609]: duplicate_check:
<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...>
DOMAIN.ORG!user.julia   0
   cyrus/lmtpunix[26609]: duplicate_check:
<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...>
DOMAIN.ORG!user.julia   0
   cyrus/lmtpunix[26609]: mystore: starting txn 2147619229
   cyrus/lmtpunix[26609]: mystore: committing txn 2147619229
   cyrus/lmtpunix[26609]: duplicate_mark:
<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...>
DOMAIN.ORG!user.julia   1342580059 0
   cyrus/lmtpunix[26609]: Delivered:
<CAACv9k3oJ8yZXwyRoGLVuKeCpUSiVEbbLWjPu5eQrTSXhbeweQ@mail...> to
mailbox: DOMAIN.ORG!user.julia
   postfix/pipe[26606]: 66E757A25FC: to=<admin@DOMA...>,
relay=procmail, delay=0.2, delays=0.16/0/0/0.04, dsn=2.0.0, status=sent
(delivered via procmail service)
   postfix/pipe[26606]: 66E757A25FC: to=<julia@DOMA...>,
relay=procmail, delay=0.2, delays=0.16/0/0/0.04, dsn=2.0.0, status=sent
(delivered via procmail service)
   postfix/qmgr[27662]: 66E757A25FC: removed
   postfix/smtpd[26599]: disconnect from
mail-ob0-f171.google.com[209.85.214.171]
-- snip --

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