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Received from Leslie Noelani at 7/3/2018 10:45 PM UTC:
I'm googling EOF (which is the other error message) and it either means "end of file" in python script (which doesn't seem to make sense here) or something related to SMTP (is that a smart phone?)
EOF means "end of file" in this context also, but it emanates from deep within the mail server software and isn't something you can do anything about.
Bottom line for members unable to post is that unless the bounce message comes from Groups.io, then the member needs to directly contact the ISP thru which the message was posted. You probably need to see that bounce message - complete with all headers - to determine where it came from. Good luck explaining to your member what "complete with all headers" means.