Are you using Oauth authentication? If not, try this: Here are the basics:

- change your security authorization to Oauth2 (do this for the incoming server settings and also for the Outgoing (SMTP) server - two places - remove the password entries for the account (remove the entire entries both incoming and outgoing) - that password info is at Tools>Preferences>Privacy&Security - click 'saved passwords' Then click 'show passwords' then highlight the rows with incoming and outgoing gmail servers and click DELete. - check to ensure that TB is set to accept cookies (that setting is just above the Passwords section) - Google will then step you through the authentication process for your PC.

David, thanks for the quick response; however, it did not solve my opportunity/problem.

I followed you directions by deleting the passwords and allowing gmail to quiz me.

This brought me back to the same place as before, able to receive but not send.

I have attached pic's of the server configuration panels.

Roger

Change the security to STARTTLS for port 587, or change the port to 465 for SSL/TLS.

I changed the security to STARTTLS and it worked as advertised.

Many thanks for the prompt support.

Roger