I am doing all this on Ubuntu 19.10 in thunderbird default application which is installed with OS. I am having problem in configuring thunderbird in VMware environment. I am using VMware 15 workstation. I have problem in using Gmail I discussed them here https://superuser.com/questions/1502126/13-66-gb-out-of-15-gb-used-in-gmail-delete-emails-that-consumed-space now I want to try the suggestion given to me. So I started configuring thunderbird in ubuntu19.10 in VMware Every thing was automatic I did not enter any values except my username and password. But I got error as shown in screenshot. In my Gmail settings I checked POP3 and IMAP are allowed. So how do I configure thunderbird in this environment to work.