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Access your cPanel dashboard .  Type "Email Routing" in the search bar or find it in the "Email" section.  On the next page, choose your domain from the drop-down list. Once you've selected the domain, you will want to make sure it's set to "local mail exchanger", then click change. 

If the Greylisting filter is enabled, the message you are seeing is quite normal, and will be applied to all incoming mail that your server receives. Please see  Greylisting - Version 64 Documentation - cPanel Documentation  for full details. WHM Server wide settings Home >> Email >> Greylisting Individual cPanel Account settings (per domain) cPanel >> EMAIL >> Configure Greylisting

Fix SSL Cert Error WHM 2087 I've spent days finding this solution so here is the result - thanks to this thread!! How to Setup WHM and CPANL so clients will be redirected to a valid SSL Certificate when logging in. Instructions based on WHM v11.15.0 1) Purchase / Install the Certificate for your fully qualified domain (ie: server.domain.com) SSL / TLS >> Install a SSL Certificate and Setup the Domain 2) Test your new CERT https://server.domain.com/ should resolve and the cert should function properly before moving forward. https://server.domain.com:2087/ should be giving you an invalid certificate error 3) Install the CERT for the WHM and CPANEL Service (this is the step you don't think about!!) Service Configuration >> Manage Service SSL Certificates > Select "Install New Certificate" for the "cPanel/WHM/Webmail Service" > Select Domain this CRT is for "Browse" > Pick the full server cert you installe...