What are the most secure settings to use for POP on a Gmail account? I am setting up POP for my Gmail because I want a local copy that’s not affected by shenanigans on the server (and vice versa). I have Thunderbird 78.6.0 I have the Gmail side set up as detailed here: https://support.google.com/mail/answer/7104828?hl=en-GB Under the Forwarding and POP/IMAP settings It has POP enabled for all mail, and set to “Keep Gmail’s copy in the inbox” when accessed with POP. I used a combination of the settings below to get everything working: https://support.mozilla.org/en-US/kb/manual-account-configuration http://kb.mozillazine.org/Using_Gmail_with_Thunderbird_and_Mozilla_Suite Under Server Settings on Thunderbird I have ticked “Leave Messages on Server” and unticked “For at most X days” and “Until I delete them” But I would like to have the most secure settings possible. I currently have the following, are there any changes I can make to make the connection more secure? (I’m particularly unsure what to put for Connection Security for the SMTP server - is STARTTLS the most secure I can use? Also I’m unwilling to move to two factor authentication, but OAuth2 seems to work fine without setting up 2 factor for the account. (https://support.mozilla.org/en-US/questions/1201406)) POP Mail Server Server Name: pop.gmail.com Port: 995 User Name: MYUSERNAME@gmail.com Connection Security: SSL/TLS Authentication Method: OAuth2 SMTP Server Server Name: smtp.gmail.com Port: 587 User Name: MYUSERNAME (without “@gmail.com”) Authentication Method: OAuth2 Connection Security: STARTTLS Thanks for any help!