I've had a lot of trouble in the last few months with Gmail's spam filtering having become super-aggressive, but tonight we have a live case worthy of analysis.  In the thread "Opinions on Fedora Server" initiated by Alberto Abrao <alberto@abrao.net>, both of Alberto's postings went to my Gmail spam, while Trevor Cordes's posting came through fine.

 

A detail on my use of Gmail:  I use it as infrastructure for my own e-mail addresses @marityme.net.  Incoming e-mails to @marityme.net are forwarded into my Gmail address from somewhere else, and outgoing e-mails from @marityme.net are sent from Gmail where I set up these addresses as valid "from" addresses.

 

Yeah, I suspect the trouble is somewhere in Gmail's new expectations re TXT SPF, DKIM, DomainKeys, and such.