The target of a CNAME, MX, and NS record should be validated to make sure there are no slashes in it. For some reason, this cut-and-paste error seems to happen a lot:

CNAME('support', 'elb21.freshdesk.com/.'),

NOTE: There should be no "/" in that target.

This should be detected at the "preview" stage, not "push" stage.

CC: @captncraig @GABeech