The Popular Anime Allow Less Secure Apps On Gmail Special Edition. Also, visit the google website for more information: In thunderbird, gmail imap mail accounts can connect using oauth2 instead of ssl/tls.
So what it means is gmail's meaning of lesssecureapp is basically anything that doesn’t use oauth2. To resolve this problem, enable the less secure apps for your gmail account. Google recently introduced a new email setting that may cause connections to the gmail smtp server to fail.
Google/gmail calls apps that don't support oauth2 less secure.
But as google said this action is not recommended, because there will be risks for you gmail account. Test your mail application again. Less secure apps and your google account; Now click the back arrow in the title, you can find the allow less secure apps has been turned on.
