Did you configure your content filter to send a bounce message?
Jul 26 19:05:57 mail1 postfix/smtpd[11093]: 67FB13910:
client=localhost[127.0.0.1]
Jul 26 19:05:57 mail1 postfix/cleanup[11094]: 67FB13910:
message-id=<dsnpqyogyjqx...@mail1.myserver.com>
That is not a Postfix-generated message ID. Is that from your content
filter?
Jul 26 19:05:57 mail1 postfix/qmgr[910]: 67FB13910: from=<>,
size=3222, nrcpt=1 (queue active)
Jul 26 19:05:57 mail1 postfix/smtp[11064]: 67FB13910:
to=<online.casino.ga...@pearls.preal.us>, relay=none, delay=0.38,
delays=0.03/0/0.35/0, dsn=4.4.1, status=deferred (connect to
mail.preal.us[5.133.8.185]:25: Connection refused
Wietse
