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https://stackoverflow.com/questions/21937586/phpmailer-smtp-error-password-command-failed-when-send-mail-from-my-server
https://github.com/PHPMailer/PHPMailer/issues/1074
https://github.com/PHPMailer/PHPMailer/issues/1189
https://wordpress.org/support/topic/smtp-error-password-command-failed/
https://www.projeqtor.org/en/kunena-2/5-ask-questions/7873-smtp-error-password-command-failed
https://www.acyba.com/forum/2-acymailing-bug-report/73767-smtp-error-password-command-failed-535-incorrect-authentication-data.html
http://know.mailsbestfriend.com/smtp_error_password_command_failed_5345714-1194946499.shtml
https://www.readmore.de/forums/91-technik/60-software/168593-php-e-mail-versand-ber-phpmailer-smtp
https://answers.microsoft.com/en-us/msoffice/forum/all/smtp-server-keeps-failing/d1a7f479-2326-4de1-9459-c650e65f5def
https://code.i-harness.com/en/q/2488e2e
http://www.fleurus.be/PHPMailer-master/mail1.php
https://www.acymailing.com/forum/2-acymailing-bug-report/68169-smtp-error-password-not-accepted-from-server-535-incorrect-authentication-data.html
https://productforums.google.com/forum/#!topic/apps/SZbc7AOr0p4;context-place=topicsearch/login$20with$20this$20username