[Identified internal IP as source]

OK.  I do report all these phishing attempts claiming to be from FastMail directly to FastMail, but I'll send them a query to see if they have anything to say about this.  Thanks!

[Identified internal IP as source]

I have been using FastMail as my primary email since Spamcop ended its email service.  Starting a couple weeks ago, when trying to report phishers, trying to get me to reveal my login for Fastmail, I'm faced repeatedly with the following response from Spamcop: 

 

"Mailhost configuration problem, identified internal IP as source

..........

No source IP address found, cannot proceed."

 

Most of the rejected submissions had supposed return paths of   <****@fastmail.fm>, and I suspected that may have had something to do with the problem, but this one had <watersh@mcmaster.ca> as its return path.

 

Is there something I can check for and tweak in the submission that will avoid the problem?  I submit using my submit......@spam.spamcop.net address including spam as attachment.

 

https://www.spamcop.net/sc?id=z6633420934zc4b80047832b0517c88c3b8fb950b1d6z