Describes the cause and action for error messages.
Error Message(English)：
not receiving email notifications
No new mail notification ・ Issue #3205 ・ k9mail/k-9 ・ GitHub
https://github.com/k9mail/k-9/issues/3205
Not Getting GitHub Notifications? : alexking.org
http://alexking.org/blog/2011/11/28/not-getting-github-notifications
Managing Your CI/CD Build Notifications - CodeShip Documentation
https://documentation.codeship.com/general/projects/notifications/
How to Get WordPress Form Notifications Using the WP Mail SMTP ...
https://wpforms.com/how-to-fix-wordpress-contact-form-not-sending-email-issue/
Troubleshooting Notifications in PublishPress - PublishPress
https://publishpress.com/docs/troubleshooting-notifications/
Bug #906124 “gerrit email notifications not being sent” : Bugs ...
https://bugs.launchpad.net/bugs/906124
Enable email notifications on Decidim | Email Handling | Heroku ...
https://www.freelancer.com/projects/website-design/enable-email-notifications-decidim/
Not Receiving Email Notifications - Page 5 - Forum - Kunena - To ...
https://www.kunena.org/forum/168-K-17-Support/121135-not-receiving-email-notifications?start=40
Not receiving email notifications for password expiring for ...
https://www.reddit.com/r/CyberARk/comments/8awft1/not_receiving_email_notifications_for_password/