Unfortunately, there is no information about sending an autoreply in the logs. But there is information about sending this auto-reply to the administrator, as I wrote above. Where to look, where to find traces of sending an auto-reply to PMG?
2024-04-25T23:08:01.062254+03:00 mail postfix/postscreen[2040005]: CONNECT from [EXTMAIL.COM_IP]:53028 to [MY_EXT_IP]:25
2024-04-25T23:08:07.210966+03:00 mail postfix/postscreen[2040005]: PASS OLD [EXTMAIL.COM_IP]:53028
2024-04-25T23:08:07.517552+03:00 mail postfix/smtpd[2040006]: connect from mxout3.extmail.com[EXTMAIL.COM_IP]
2024-04-25T23:08:10.700542+03:00 mail pmgpolicy[2037953]: reloading configuration Proxmox_ruledb
2024-04-25T23:08:10.948395+03:00 mail pmgpolicy[2037953]: SPF says pass
2024-04-25T23:08:17.390277+03:00 mail postfix/smtpd[2040006]: 5EEE020041: client=mxout3.extmail.com[EXTMAIL.COM_IP]
2024-04-25T23:08:17.402006+03:00 mail postfix/cleanup[2041373]: 5EEE020041: message-id=<
554e7359013b156234a9e74aea98ad16@mail.extmail.com>
2024-04-25T23:08:17.405173+03:00 mail postfix/smtpd[2040006]: disconnect from mxout3.extmail.com[EXTMAIL.COM_IP] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
2024-04-25T23:08:17.405975+03:00 mail postfix/qmgr[578731]: 5EEE020041: from=<
own@extmail.com>, size=2384, nrcpt=1 (queue active)
2024-04-25T23:08:17.512500+03:00 mail pmg-smtp-filter[2040060]: 2024/04/25-23:08:17 CONNECT TCP Peer: "[127.0.0.1]:43478" Local: "[127.0.0.1]:10024"
2024-04-25T23:08:17.617855+03:00 mail pmg-smtp-filter[2040060]: 204CF662AB83189807: new mail message-id=<
554e7359013b156234a9e74aea98ad16@mail.extmail.com>#012
2024-04-25T23:08:18.953415+03:00 mail pmg-smtp-filter[2040060]: 204CF662AB83189807: SA score=0/5 time=1.211 bayes=0.00 autolearn=no autolearn_force=no hits=AWL(0.328),BAYES_00(-1.9),DKIM_INVALID(0.1),DKIM_SIGNED(0.1),DMARC_PASS(-0.1),FREEMAIL_FROM(0.001),HTML_MESSAGE(0.001),KAM_DMARC_STATUS(0.01),KAM_NUMSUBJECT(0.5),SPF_PASS(-0.001),T_SPF_HELO_TEMPERROR(0.01)
2024-04-25T23:08:18.985189+03:00 mail postfix/smtpd[2041401]: connect from localhost.localdomain[127.0.0.1]
2024-04-25T23:08:18.990504+03:00 mail postfix/smtpd[2041401]: F1B8920827: client=localhost.localdomain[127.0.0.1], orig_client=mxout3.extmail.com[EXTMAIL.COM_IP]
2024-04-25T23:08:19.035821+03:00 mail postfix/cleanup[2041373]: F1B8920827: message-id=<
554e7359013b156234a9e74aea98ad16@mail.extmail.com>
2024-04-25T23:08:19.040263+03:00 mail postfix/qmgr[578731]: F1B8920827: from=<
own@extmail.com>, size=3445, nrcpt=1 (queue active)
2024-04-25T23:08:19.040458+03:00 mail postfix/smtpd[2041401]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
2024-04-25T23:08:19.040650+03:00 mail pmg-smtp-filter[2040060]: 204CF662AB83189807: accept mail to <
andy@mydomain.com> (F1B8920827) (rule: default-accept)
2024-04-25T23:08:19.049527+03:00 mail pmg-smtp-filter[2040060]: 204CF662AB83189807: processing time: 1.476 seconds (1.211, 0.091, 0)
2024-04-25T23:08:19.050411+03:00 mail postfix/lmtp[2041374]: 5EEE020041: to=<
andy@mydomain.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=11, delays=9.8/0.1/0.06/1.5, dsn=2.5.0, status=sent (250 2.5.0 OK (204CF662AB83189807))
2024-04-25T23:08:19.050780+03:00 mail postfix/qmgr[578731]: 5EEE020041: removed
2024-04-25T23:08:19.321748+03:00 mail postfix/smtp[2041402]: F1B8920827: to=<
andy@mydomain.com>, relay=192.168.1.12[192.168.1.12]:25, delay=0.33, delays=0.05/0.09/0.06/0.13, dsn=2.6.0, status=sent (250 2.6.0 <
554e7359013b156234a9e74aea98ad16@mail.extmail.com> [InternalId=126010045497352, Hostname=exch2013.mydomain.com] Queued mail for delivery)
2024-04-25T23:08:19.322065+03:00 mail postfix/qmgr[578731]: F1B8920827: removed
2024-04-25T23:08:34.284568+03:00 mail pmgpolicy[827]: starting policy database maintenance (greylist, rbl)
2024-04-25T23:08:34.345057+03:00 mail pmgpolicy[827]: end policy database maintenance (28 ms, 7 ms)
there's nothing else
The tracking center is also empty.
Сan any postfix settings affect this?