Email Notification Issues

About the Email Notification Issues category (1)
Email notifications not being sent (2)
Telegram instead of mail notification (2)
Local routines database error (2)
Service Down Alert Offline Notification Emails contain incorrect timestamp (11)
Outlook sending failed (421) (3)
Email settings edit are not keeped (6)
Authentication unsuccessful (535) (7)
Custom email settings - test message error (2)
Full backup email notifications not being sent (4)
Emalis Not Working with Custom SMTP Server (2)
Email Not Sending (3)
Email notification (2)
Amazon c3 service has added this email address to a blacklist (2)
Emails not being sent (6)
Backup failure notifications no longer seem to be sent since upgrading to v11 (9)
New bug in email authentication? (3)
Email fails authentication (4)