Fix using nodemailer

[Noviny]

NB: This is a branch off #19. I've unified it so there is only one processAddress function. This has meant a bit of variance from either one individually:

• An address is always returned, meaning all return object are at minimum { email, address }
• If name and email is provided, address string is always a union name address
• Removed nodemailer-specific email regex (we are shying away from confirming emails are emails)

These changes break three of the nodemailer tests. Want to make sure this is fine before fixing those tests to pass.

[quaz579]

Is there any more information on this? We'd like to use nodemailer in our project and this fix is necessary to enable it.