I see several problems with the content filter. First the content filter appears to be using the same temporary file when different messages arrive at almost the same time.
Before your content filter, these messages have different message IDs: message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> message-id=<3CCEA7A26F3E4A69BAD8578B55ED7319@m19c68eb1c6704> After your content filter, the messages have the same message ID: message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> This means that the messages were using the same file. > $file=uniqid(); > $f=fopen($file,'w'); Try prepending the process ID to the uniqid() result. Second, your content filter will mis-deliver email with more than one recipient. As documented in the pipe(8) manpage, ${recipient} will expand into multiple command-line arguments. > filter unix - n n - 10 pipe > flags=Rq user=marcin null_sender= > argv=/usr/bin/filter_poczta.php -s ${sender} -r ${recipient} -u > ${sasl_username} To avoid this error specify: /etc/postfix/main.cf: filter_destination_recipient_limit = 1 (and execute "postfix reload"). I suspect that there is a similar issue with your pipe-to-dovecot adapter. Again, setting "dovecot_destination_recipient_limit = 1" will avoid this error. Wietse Message 1 before filter: > Dec 8 20:36:26 serwery postfix/smtpd[2112]: connect from > mta147.esp4.eu[178.33.185.147] > Dec 8 20:36:27 serwery postfix/smtpd[2112]: 0DFFADE3C8B: > client=mta147.esp4.eu[178.33.185.147] > Dec 8 20:36:27 serwery postfix/cleanup[27880]: 0DFFADE3C8B: > message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 0DFFADE3C8B: > from=<28565-59746...@codziennie1prezent.pl>, size=20398, nrcpt=1 (queue > active) > Dec 8 20:36:27 serwery postfix/smtpd[2112]: disconnect from > mta147.esp4.eu[178.33.185.147] > Dec 8 20:36:27 serwery postfix/pipe[24740]: 0DFFADE3C8B: > to=<us...@mydom2.pl>, relay=filter, delay=0.3, delays=0.16/0.02/0/0.13, > dsn=2.0.0, status=sent (d elivered via filter service) > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 0DFFADE3C8B: removed Message 1 after filter: > Dec 8 20:36:27 serwery postfix/pickup[23435]: 4D495DE3C8B: uid=500 > from=<28565-59746...@codziennie1prezent.pl> > Dec 8 20:36:27 serwery postfix/cleanup[27880]: 4D495DE3C8B: > message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 4D495DE3C8B: > from=<28565-59746...@codziennie1prezent.pl>, size=20507, nrcpt=1 (queue > active) > Dec 8 20:36:27 serwery dovecot: lda(us...@mydom2.pl): sieve: > msgid=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu>: stored mail into mailbox > 'INBOX' > Dec 8 20:36:27 serwery postfix/pipe[1473]: 4D495DE3C8B: > to=<us...@mydom2.pl>, relay=dovecot, delay=0.48, delays=0.2/0/0/0.28, > dsn=2.0.0, status=sent (deli vered via dovecot service) > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 4D495DE3C8B: removed Message 2 before filter: > Dec 8 20:36:27 serwery postfix/smtpd[6007]: connect from ut.pl[178.250.45.37] > Dec 8 20:36:27 serwery postfix/smtpd[6007]: 1B54EDE3C90: > client=ut.pl[178.250.45.37] > Dec 8 20:36:27 serwery postfix/cleanup[28725]: 1B54EDE3C90: > message-id=<3CCEA7A26F3E4A69BAD8578B55ED7319@m19c68eb1c6704> > Dec 8 20:36:27 serwery postfix/smtpd[6007]: disconnect from > ut.pl[178.250.45.37] > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 1B54EDE3C90: from=<bi...@ut.pl>, > size=975, nrcpt=1 (queue active) > Dec 8 20:36:27 serwery postfix/pipe[7758]: 1B54EDE3C90: > to=<us...@mydom1.pl>, relay=filter, delay=0.18, delays=0.06/0.02/0/0.11, > dsn=2.0.0, status=sent (d elivered via filter service) > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 1B54EDE3C90: removed Message 2 after filter (note that the content has been replaced with message 1, but the sender and recipient have not been replaced): > Dec 8 20:36:27 serwery postfix/pickup[23435]: 43E18DE3C9A: uid=500 > from=<bi...@ut.pl> > Dec 8 20:36:27 serwery postfix/cleanup[28725]: 43E18DE3C9A: > message-id=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu> > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 43E18DE3C9A: from=<bi...@ut.pl>, > size=20507, nrcpt=1 (queue active) > Dec 8 20:36:27 serwery dovecot: lda(us...@mydom1.pl): sieve: > msgid=<0.0.a.f4.1cef44d1247f0b...@mta147.esp4.eu>: stored mail into mailbox > 'INBOX' > Dec 8 20:36:27 serwery postfix/pipe[18099]: 43E18DE3C9A: > to=<us...@mydom1.pl>, relay=dovecot, delay=0.28, delays=0.08/0/0/0.2, > dsn=2.0.0, status=sent (del ivered via dovecot service) > Dec 8 20:36:27 serwery postfix/qmgr[5555]: 43E18DE3C9A: removed