I got the same problem.
129.x.x.x failed after I sent the message.
Remote host said: 550-SpamAssassin guessed that message "1FHMeG-0002vs-5D" was spam, 550-contact
[email protected] for further information 550 X-UiB-SpamReport: 204.14.107.1 is (rbl.uib.no) blacklisted Blocked - see...