Testing Wealthy Affiliate transfer Email.
I f you use Wealthy "Forward To" email service be aware that if you test it by sending an email to that account, you should also include a message. Apparently, if you send a blank message to your WA Forwarding Email account, it will return to you as undelivered.
I would also assume if you send an Email that contains spam to your WA Email it will be rejected as well.
To test your email accounts at WA make sure you have sufficient content in the message portion and preferably no spam.