In particular one using a gmail addy ...
WTF can't I reply to your posts ? It's only you - something somewhere is putting a CR/LF in the "References" header field which is causing either ES, or PAN to throw a wobbly and refuse to post.
Annoyingly it doesn't seem to trip an error, so I type a response, just to see it disappear ?
I have examples of the malformed (?) headers and can post if it helps.