>Another tip for domains that don't send email: set a null mx record. This explicitly tells sending servers that your domain does not receive mail...

Most of my domains don't send mail, however I do prefer to receive mail to the standard aliases (webmaster@, abuse@, etc) and often a catchall. Even for domains I've got parked and awaiting deployment.

Am I thinking too much, not enough, or is the opening phrase of the advice meant to be "Another tip for domains that don't intend to receive email"?