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https://support.mozilla.org/questions/999141
https://support.mozilla.org/questions/1170266
https://support.mozilla.org/questions/1199555
http://forums.mozillazine.org/viewtopic.php?f=39&t=2070809
https://apple.stackexchange.com/questions/282460/why-do-i-get-a-connection-to-the-outgoing-server-smtp-gmail-com-failed-messa
https://discussions.apple.com/thread/5379757
https://www.wpsitecare.com/gmail-smtp-settings/
https://productforums.google.com/forum/#!topic/gmail/zdyopL7WCeQ
https://liquidwarelabs.zendesk.com/hc/en-us/articles/360000938792-Integration-of-Google-Gmail-In-Outlook-2016-Through-IMAP-Configuration
https://support.google.com/mail/answer/7126229?hl=en
https://www.hostinger.com/tutorials/how-to-use-free-google-smtp-server
https://oit.colorado.edu/tutorial/gmail-configure-outlook-windows
https://feedbackwrench.com/gmail-on-outlook-setup-login-popup-error-fix-found/