In China Internet, even forward/reverse proxy smtp.gmail.com still can't send gmail properly.

[nickfox-taterli]

Fail

Ok

I tested via Telnet, I can still write messages after receiving 220 smtp.gmail.com even through the forward proxy (or reverse proxy as shown), why does ThunderBird stop writing messages?

I would like to get more information on debugging and why this is happening.

[nickfox-taterli]

The following two addresses still require a proxy.

And it doesn't seem to allow TLS exceptions, if allows TLS exceptions, I can apply a layer of reverse proxy to make it easier for me to use.

accounts.google.com
www.googleapis.com