I use Thurderbird to send and receive from Gmail and what I did
on previous versions of TB was put the port on the end of the server:
pop.servername.com:port

Have you got smtp authentication enabled with user and password?

I use GMail with Evolution all the time when in Linux Mode.

Server Configuration: smtp.gmail.com, Server req. Authentication

Security : Set to TLS

Authentication: set to Plain

The only difference is that I use POP instead of IMAP for receiving,
but that should be inconsequential to this matter.

I use GMail with Evolution all the time when in Linux Mode.

Server Configuration: smtp.gmail.com, Server req. Authentication

Security : Set to TLS

Authentication: set to Plain

The only difference is that I use POP instead of IMAP for receiving,
but that should be inconsequential to this matter.

I believe port should be 465 for SMTP amd 995 for POP. I don't have my machine
handy to check for sure.

I have outgoing:
smtp.gmail.com 587 using TLS

Incoming:
pop.gmail.com pt 995 using SSL

IT WORKS. Thanks to all those who responded. I actually had to use
port 587 for SMTP to get it to work. This is described in the Gmail
documentation as an alternative to port 465. Also, under
Authentication where it asks for Username, I had to put in my full
email address.

IT WORKS. Thanks to all those who responded. I actually had to use
port 587 for SMTP to get it to work. This is described in the Gmail
documentation as an alternative to port 465. Also, under
Authentication where it asks for Username, I had to put in my full
email address.