Verify Receivers stop works

[Know_new]

Hello there
I noticed what option Verify receivers (now is set 550) stopped works.
If I try send message via telnet to blabla@mydomain.com proxmox mg answer O.K.
Early was work fine.
I had switched it to off and back to 450 or 550 – no results.
We use proxmox MG as relay and Exchange server behind as mail server
Trying 192.168.10.11...

Connected to 192.168.10.11.

Escape character is '^]'.

220 mail.mydomain.com
helo bns
250 mail.mydomain.com
mail from:test@test.com
250 2.1.0 Ok
rcpt to:hjdfwj@mydomain.com
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
subject: test spam
test test
.
250 2.0.0 Ok: queued as 1D57B181138
quit
221 2.0.0 Bye
Connection closed by foreign host.

Logs PM MG are:

20:04:06 mydomain.com postfix/cleanup[2445590]: 90546181727: message-id=<20230822170405.90546181727@mydomain.com>

20:04:06 mydomain.com postfix/qmgr[2289481]: 90546181727: from=<double-bounce@mydomain.com>, size=251, nrcpt=1 (queue active)

20:04:07 mydomain.com postfix/smtp[2445560]: Untrusted TLS connection established to 192.168.2.28[192.168.2.28]:25: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)

20:04:12 mydomain.com postfix/smtp[2445560]: 90546181727: to=<d5a7s9h3a0.1k4h2a6m1u1t6i4n5i0n5a5@mydomain.com>, relay=192.168.2.28[192.168.2.28]:25, delay=6.3, delays=0.38/0/0.5/5.4, dsn=2.1.5, status=deliverable (250 2.1.5 Recipient OK)

20:04:12 mydomain.com postfix/qmgr[2289481]: 90546181727: removed


How to fix it?
Regards

 

[Know_new]

Hello there
I noticed what option Verify receivers (now is set 550) stopped works.
If I try send message via telnet to blabla@mydomain.com proxmox mg answer O.K.
Early was work fine.
I had switched it to off and back to 450 or 550 – no results.
We use proxmox MG as relay and Exchange server behind as mail server
Trying 192.168.10.11...

Connected to 192.168.10.11.

Escape character is '^]'.

220 mail.mydomain.com
helo bns
250 mail.mydomain.com
mail from:test@test.com
250 2.1.0 Ok
rcpt to:hjdfwj@mydomain.com
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
subject: test spam
test test
.
250 2.0.0 Ok: queued as 1D57B181138
quit
221 2.0.0 Bye
Connection closed by foreign host.

Logs PM MG are:

20:04:06 mydomain.com postfix/cleanup[2445590]: 90546181727: message-id=<20230822170405.90546181727@mydomain.com>

20:04:06 mydomain.com postfix/qmgr[2289481]: 90546181727: from=<double-bounce@mydomain.com>, size=251, nrcpt=1 (queue active)

20:04:07 mydomain.com postfix/smtp[2445560]: Untrusted TLS connection established to 192.168.2.28[192.168.2.28]:25: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)

20:04:12 mydomain.com postfix/smtp[2445560]: 90546181727: to=<d5a7s9h3a0.1k4h2a6m1u1t6i4n5i0n5a5@mydomain.com>, relay=192.168.2.28[192.168.2.28]:25, delay=6.3, delays=0.38/0/0.5/5.4, dsn=2.1.5, status=deliverable (250 2.1.5 Recipient OK)

20:04:12 mydomain.com postfix/qmgr[2289481]: 90546181727: removed

We founded issue
When we deploy a new addition exchange server with more version - recipient verify option became off - its default. After enabled this feature all work fine again.