On Wed, Mar 04, 2015 at 11:57:52PM +1100, James Brown wrote:

> Just had one today. It was originally sent on 26 Feb, the wrong user just had 
> it delivered today.

Are you sure it is the same message?

> Mar  4 22:15:15 mail postfix/smtpd[53229]: connect from localhost[127.0.0.1]

Find the *upstream* logs, what's connecting to 127.0.0.1?  Look
for  279374563492 or the message-id in log entries that deliver email
to 127.0.0.1.

> Mar  4 22:15:15 mail postfix/cleanup[53149]: 279374563492: 
> message-id=<20150226073917.0001.CanonTxNo.4122@[192.168.1.78]>
> Mar  4 22:15:15 mail postfix/qmgr[122]: 279374563492: 
> from=<scan...@bordo.com.au>, size=40758, nrcpt=1 (queue active)
> 
> This was the mail originally being sent:
> 
> Feb 26 09:40:46 mail postfix/smtpd[93571]: connect from localhost[127.0.0.1]
> Feb 26 09:40:47 mail postfix/smtpd[93571]: 2DC2644E6BCB: 
> client=localhost[127.0.0.1], sasl_method=PLAIN, 
> sasl_username=scan...@bordo.com.au

Perhaps a copy of the message was quarantined and released (to a
different address) later.  Or the content filter sent the wrong
message content for a new envelope.

> Feb 26 09:40:48 mail postfix/cleanup[93574]: 2DC2644E6BCB: 
> message-id=<20150226073917.0001.CanonTxNo.4122@[192.168.1.78]>
> Feb 26 09:40:48 mail postfix/qmgr[6200]: 2DC2644E6BCB: 
> from=<scan...@bordo.com.au>, size=40950, nrcpt=1 (queue active)

Note the slightly different message size this time.

Hard to know what's going on without the input-side (pre-filter)
logging.

-- 
        Viktor.

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