[Resolved] Can't send mail with GMail smtp server

I have been trying to send mail using smtp.gmail.com with all variations without any success. Can somebody tell me the setup? I can't find it on the Internet.

I have the same account set up on the regular Mozilla Thunderbird and it works fine. The setup is smtp.gmail.com, port 587 with secure connection set to TLS among others like "No", "TLS, if available", "TLS", "SSL".

On the portable Thunderbird, the connection security has the options among NONE, STARTTLS, SSL/TLS, different from the regular one. I tried every possibility but none work.

By the way, the incoming mail is set to use IMAP4 protocol, not POP3.