Hello Cammy.busto,
This would be expected behaviour.
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Message xxxx Enqueued on incoming connection from system@example.com
Message xxxx Incoming connection (ICID 11330679) to rejected by LDAP acceptance query
Message xxxx Aborted: Receiving aborted by sender
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Essentially after the 3 way handshake was done on the SMTP conversation.
This server sent the mail-from command with sender system@example.com
ESA accepted (hence you can see it 'from' this sender.
The connecting mail server then sends the rcpt to:address@domain.com
ESA returned a 554 Address Rejected by LDAP Acceptance Query.
So the connecting server closes the connection, as you can see with Message Aborted.
EDIT: The subject line will not appear in the message tracking or mail_logs until the entire message body data has been accepted into the ESA.
You had shared that your ESA is integrated with LDAP, so it's verifying this recipient address against your integrated LDAP where your LDAP has said "this user does not exist" thus the ESA rejected the recipient.
If this recipient -should not- be checked under LDAP for any reason, you can create a specific user recipient ID, or recipient domain to bypass your LDAP accept.
Please let me know if there's anything unclear.
Thanks.
Matthew
