This message is being sent in gmail in Chromium running on Wine with options --no-sandbox --use-nss-for-ssl.
(--use-nss-for-ssl turns on a new alternate https stack that works in wine.)
This copy of Chromium was built in Wine, too. It took 1 hour 55 minutes to compile and link from scratch using Visual C++ 2005 in Wine on a q9300. (And that's compiling with /MP to use all cores; wthout /MP, it takes three and a half hours, IIRC.)
See http://wiki.winehq.org/BuildAndTestChromium for easy instructions on how to do this. - Dan