Unknown error: permanent error (550): 5.7.1 [18.104.22.168 12] Our system has detected that this message is\n5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail,\n5.7.1 this message has been blocked. Please visit\n5.7.1
I’m getting the same “Unknown error: permanent error (550): 5.7.1 Rejected by spam filter” error. It would be nice if somehow we could get more info about these messages (maybe if we could see the full header?). At the moment 73% of my mail is forwarded but 27% is resulting in an Error and I can only see who the sender is.