When trying to send out email, you are receiving bounce back messages that contain the following line:

Domain example.com has exceeded the max defers and failures per hour (#/# (100%)) allowed. Message discarded.
(where example.com is your actual domain name and # represents the number of failures for the hour)


What is the cause of this?

The mail server will limit sending capabilities for any domain receiving a high number of deferred (mail that was unable to deliver to the sender and has been added to the servers mail queue) or failed emails (a message that failed to reach its recipient), as this is almost always an indication of spam going out from the domain.

However, there are a few other reasons why you may be receiving these types of bounce backs. Please see below.

  • You have an autoresponder set up that is replying to spam email addresses that don't exist.
  • You have a mailing list setup with emails address that no longer exist.
  • Your email address may have been compromised and is being used to send spam.

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What do I need to do?

The max defer limitation is reset every hour, however, if the mail server continues to receive deferred or failed bounce back emails originating from your domain name, you will continually trigger that setting. This is why it's important to address the issue right away to guarantee you don't run into problems again in the future.

  • If you have an autoresponder setup, try removing the autoresponder and see if the issue clears up.
  • If you have a mailing list setup, pay close attention to any bounce back emails you are seeing come back after your mailing goes out and remove the problem email accounts from your list. Some mailing lists will manage bounced emails for you, however, we suggest you also do a manual check.
  • If you believe your hosting account or email address has been compromised and is being used to send spam, you will want to change your password(s) right away to prevent further spam from going out.

Information regarding changing your cPanel password can be found here: Update cPanel password

Information regarding changing your email password(s) can be found here: Change your email password

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Still Having Issues?

If you are still having issues, you can contact our Customer Support in the following methods:

Live Chat

You can connect to our Live Chat Support Team from your MacHighway Client Area. If you are not sure how to do this, you can find a guide here.

Our Live Chat team is available Monday to Friday from 9:00 AM to 7:00 PM Eastern Time.

Support Ticket

You can submit a support ticket to our Support Team from your client area.

Our ticket Support Team is available 24/7/365.

Phone support

You can contact our Phone Support Team using the following number:

  • US/Canada 1-888-974-0334
  • International 1-727-800-3606
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