VPN and Thunderbird

[jdurand]

Thunderbird often hangs when the VPN is on, even in the simplest configurations.

Example:

Our IMAP server is in Moscow (ISPSERVER.com);

I set the VPN to FASTEST SERVER and it picks Moscow;

Try to send an e-mail, Thunderbird just hangs on SENDING.

Cancel send;

Turn off VPN;

Try sending from Thunderbird, a few seconds and it's done.

Windows 10 Pro

ROSTELCOM internet, but I've seen the same thing in other countries.

 

[Berny]

@jdurand

In some cases an ISP cannot identify his own SMTP server and is refusing outgoing traffic. Please add TB to the split Tunneling exclusions ?