- Check the email address
- Look for a bounce notification
- Check any system-wide rules in place
- Check for a folder rule
- Check the folder size
Verify the input email address is valid and working.
Study any emails received from the email service provider in the bounces folder to identify why the email delivery failed.
Look for any rules that would deliver emails elsewhere or block the email from being delivered.
Check if the user has set up a folder rule to place the email in a specific folder or set of folders.
If the user has a full mailbox, emails may not get delivered to a specific folder.
