What is this error?
If you are receiving an error similar to “Domain example.com has exceeded the max defers and failures per hour (15/15 (100%)) allowed“ in an email bounceback, it means that outgoing email from your domain has triggered a rule in the server that will stop any further email from going out of the server. This happens when a domain account sends emails that fail or get deferred. No further emails are allowed if the number of failures or defers exceeds the server limit.
How can I fix this?
This error is derived from an hourly monitoring system, where any blocked domains can send emails again at the top of every hour. For example, if you received this error at 2:45 pm, the block will release at 3:00 pm, and the domain will be able to send emails out once more.
In short, please retry to send your message after one hour.
For @nili.ca users, if you see this message more than twice, please let us know.