Spamassassin has logic to detect if the last Received header is from an authenticated client in order to bypass filtering checks. (/lib/Mail/SpamAssassin/Message/Metadata/Received.pm)
The syntax MailEnable uses:
Code: Select all
Received: from Workstation ([192.168.0.100]) by example.com with
MailEnable ESMTPA; Thu, 20 May 2021 13:46:31 -0400
Code: Select all
Received: from Workstation ([192.168.0.100]) by example.com with
ESMTPA; Thu, 20 May 2021 13:46:31 -0400
The MailEnable syntax should be changed to work with Spamassassin's regex, or the above file should be patched to account for MailEnable's syntax.