What do you do if Email delivery fails?

First of all you need to find out why the email is not being delivered to the recipient. You can try checking your recipient's email address make sure that it is correctly spelled and contains no unnecessary punctuation.

There are other reasons as to why the email deliver is failing:

• an email delivery fails because the email address is no longer active.
• an email delivery fails because the receiver has used his email bandwidth space
• an email delivery fails because the recipient has enabled spam filters

To validate an email address you can use this tool- email-checker com

If the email is still valid, all you can do is try again, otherwise there's nothing else you can do if the recipient's email is invalid.