Adding an email with a dot to Project Recipient List will generate an invalid email error message and not send the email.

Specifically I have a recipient list like the following:
"a@z.com, a.b@z.com, c@z.com"

The error I see in the log is:
Error sending to the following INVALID addresses: a.b@z.com

Unfortunately this kills my ability to use the plug-in as I can't specify the appropriate email address (unlike other users, I am not sending to gmail which seems to deal with missing dots).