When you receive a message saying "unable to verify address", please make sure that you have enabled the SMTP authentication option in your email client. Also, note that you have to use the full e-mail address for username.
Example: you@yourdomain.com instead of you.
For more information on how to set up your email client, you can refer to our tutorial:
http://hostlantern.com/clients/knowledgebase.php
Setting up your email is easy when you have the right host by your side. If you need a reliable partner to help you resolve email issues and provide expert support, check out our email hosting services.