Some of our customers have tried to test how Prospect.io works by adding themselves as a prospect and then sending an email to their own address.
Unfortunately this doesn’t work when you use an email alias to send through Prospect.io because Gmail does not allow it.
There is, however, a workaround! For the message to appear in your inbox, you need to configure the alias as an alternate "Send mail as" address.
For more information please see: https://support.google.com/a/answer/1703601?hl=en.