On the web hosting servers linux1.hccl.net and host2.hay.net a customer start having trouble sending e-mail if they hit the Max Defers Limit. This can happen if they have a send fail five times or so (it’s percentage based) within an hour. Then they will have to wait an hour for it to clear. If they continue to send failed emails they will increase their limit.
The first thing a customer should do is log into their cPanel and under the Email section they can choose Track Delivery. If they click Show Failed & Blocked they will see a list below indicating the failures.
The customer can then find out who sent the emails that started the failures. The customer should then have the sender remove those addresses from their address books or update them to the correct new addresses to lower the chances of this happening again and again.
Usually it is due to a mass email being sent out and some of the e-mail addresses being incorrect and generating a failures.
If a customer needs their cPanel Welcome Letter re-sent to the account holder to gain access to their username and password please fill out this form.
Thanks.