EmailSend error: "Invalid Address(es)"

[wbasham]

It appears there is an issue sending messages using the plugin with some OS X. The EmailConnect works fine as do many of the other functions. But the EmailSend function returns the "Invalid Address(es)" error. The stack trace shows the following exception:

SMTPAddressFailedException: 504 5.5.2 <10.0.1.13>: Helo command rejected: need fully-qualified hostname

This is due to the spam settings on the mail server. A fix can be found here.