MX Records are correct, receiving no incoming mail

MX Records are correct, receiving no incoming mail

As stated in the title, the MX records are correct (as seen in the cPanel, as well as  http://mxtoolbox.com/SuperTool.aspx?action=mx%3ainfo%40elementsoffice.ca&run=toolpage and others) but we are receiving no incoming mail. Sending mail is fine.