POP
Type: POP
Server Name: pop.gmail.com
User Name: Your FULL email address
Port: 995 (this should be automatically set when you select SSL/TLS)
Secure connection: SSL/TLS
Secure authentication: normal password. (OAuth2 is not supported by Gmail for POP accounts)
IMAP
Type: IMAP
Server Name:imap.gmail.com
User Name: Your FULL email address
Port: 993 (this should be automatically set when you select SSL)
Secure connection: SSL/TLS
Secure authentication: normal password or OAuth2 (recommended)
Set tools -> account settings -> server settings -> advanced -> IMAP server directory to [Gmail] to fix problems with how it lists folders in the folder pane.
SMTP
Server Name:smtp.gmail.com
Port: 587 (you could also use port 25 if your ISP doesn't block it)
Username: Your FULL email address
Secure connection: STARTTLS
Secure authentication: normal password or OAuth2 (recommended)
Don't configure Thunderbird to save a copy of any messages you send in tools -> account settings -> copies & folders. Gmail's SMTP server automatically saves a copy of any message you send in the Sent Items folder for you.
The SMTP server also supports using port 465 with SSL/TLS.
—mozillazine.org
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