Hello. Here is the log after disabling the reject reasons: Jul 28 07:44:04 mail postfix/smtpd[12265]: connect from itexchange16.itbspa.local[192.168.116.200] Jul 28 07:44:05 mail postfix/smtpd[12265]: Anonymous TLS connection established from itexchange16.itbspa.local[192.168.116.200]: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits) Jul 28 07:44:05 mail postfix/verify[12269]: cache btree:/var/lib/postfix/verify_cache full cleanup: retained=0 dropped=0 entries Jul 28 07:44:05 mail postfix/cleanup[12270]: 3xJd7n0QgSz110M: message-id=<3xjd7n0qgsz1...@mail.itbspa.de> Jul 28 07:44:05 mail postfix/qmgr[12176]: 3xJd7n0QgSz110M: from=<double-bou...@itbspa.de>, size=223, nrcpt=1 (queue active) Jul 28 07:44:05 mail postfix/smtp[12271]: Untrusted TLS connection established to 172.18.1.11[172.18.1.11]:25: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits) Jul 28 07:44:10 mail postfix/smtp[12271]: 3xJd7n0QgSz110M: to=<j.wallin...@bspa.de>, relay=172.18.1.11[172.18.1.11]:25, delay=5.1, delays=0/0.02/0.1/5, dsn=2.1.5, status=deliverable (250 2.1.5 Recipient OK) Jul 28 07:44:10 mail postfix/qmgr[12176]: 3xJd7n0QgSz110M: removed Jul 28 07:44:11 mail postgrey[789]: action=pass, reason=client whitelist, client_name=itexchange16.itbspa.local, client_address=192.168.116.200, sender=ebenb...@itbspa.de, recipient=j.wallin...@bspa.de Jul 28 07:44:11 mail postfix/smtpd[12265]: NOQUEUE: reject: RCPT from itexchange16.itbspa.local[192.168.116.200]: 450 4.1.1 <j.wallin...@bspa.de>: Recipient address rejected: unverified address: Address verification in progress; from=<ebenb...@itbspa.de> to=<j.wallin...@bspa.de> proto=ESMTP helo=<webmail.itbspa.de> Jul 28 07:44:11 mail postfix/smtpd[12265]: disconnect from itexchange16.itbspa.local[192.168.116.200] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6
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