So I have mailchannels set up as a “Sender-dependent transport”. My email has been relayed via them for a while now but recently started getting flagged and blocked for sending via “ _forwarded-from|127.0.0.1” . I’m not using an additional forwarder of any kind. Mailchannels is not providing much feedback to help resolve the issue.
They said the sender id should not be 127.0.0.1 which looking at their logs sometimes shows up and sometimes does not. Do I have a configuration issue? Can someone point me to more information on how to correct this from my end if I can?