Domain domainname.com has exceeded the max defers and failures per hour (5/5 (100%)) allowed. Message discarded.
What does it mean?
This bounce message means that the senders domain name (as given in the error message) has been sending out mail which is not getting delivered to the intended recipients. Due to a large number of such messages failing to be delivered, the mail server has prevented any more mails being sent by the domain name, for the rest of the hour.
Why are all my mails bouncing with this error message?
This is a security measure active on our server which is triggered when a “sufficiently significant” number of mails from an email account bounce or are undelivered. This is indicative of spammy activity or a compromised account.
Possible reasons for getting this bounce message are:
What should I do so that I can resume normal mailing?
Many a times, the best thing to do is stop all mailing activity and identify the problematic recipient addresses. Refer to our article on Tracing Email Deliveries and Failures.
if your email address has been compromised or hacked refer to our article: How email accounts get hacked
If your website form or page has been hacked see our article: How to recover from a hacked website
I am not able to send mail from any email address on the affected domain. For how much time are all the addresses blocked?
Yes. Your entire domain name is prevented from sending any more mails out from our server. This is a security measure to ensure that our server cannot be used to send out unsolicited bulk mail or spam.
The restriction on sending any more emails will last for 1 hour from the time the last email bounced or delivery was deferred. So if the last of the mails bounced at 10:08 a.m. you will be able to resume normal email delivery only at 11:09 a.m.
Will I continue to receive incoming emails on my domain?
Yes. Incoming emails are not affected by this security measure and will continue to work through the block period.