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https://support.mozilla.org/questions/1052629
https://drfone.wondershare.com/iphone-problems/cannot-get-mail-the-connection-to-the-server-failed.html
https://www.stellarinfo.com/blog/how-to-fix-iphone-error-cannot-get-mail-the-connection-to-the-server-failed/
https://blog.fonepaw.com/iphone-ipad-cannot-get-mail-the-connection-to-the-server-failed.html
https://social.technet.microsoft.com/Forums/lync/en-US/3f7323b7-ab34-4488-9f96-f0d5a938f35e/logging-on-to-mail-server-failed-within-outlook?forum=exchangesvrgeneral
https://support.plesk.com/hc/en-us/articles/213921285-Unable-to-access-webmail-Error-connecting-to-mail-server
https://support.apple.com/en-us/HT204075
http://networkoverload.com/errors/apple_mail/trying_to_log_to_smtp_account_failed_verify_username_and_password_are_correct
https://www.imore.com/how-fix-connection-errors-mail-iphone-ipad
https://www.rackaid.com/blog/unable-to-send-email/
https://help.hover.com/hc/en-us/articles/217281777-Email-server-settings-
http://osxdaily.com/2018/10/13/fix-cannot-get-mail-error-ios/
https://forums.cpanel.net/threads/connection-to-imap-server-failed.96021/