New customers:

Make sure that your MX records were entered exactly as they were given to you. 

If your mail server is using cPanel, be sure to read about this simple tweak.

Check to if your host is on the list of Hosting Providers Requiring Special Attention.

Existing customers:

The most common cause is a configuration issue with your mail server.  To help troubleshoot the issue, login to the SpamHero control panel and view the raw mail delivery logs.

If you open a support ticket when your email isn't working, be sure to provide an alternate email address that we can still reach you at!