SendEmail Reactor Will Try to Send Email with no valid To, Cc, or Bcc Headers

[Jason Stephenson]

The SendEmail Reactor for Action Trigger will attempt to send an email, even if all of the To, Cc, and Bcc headers are empty.

I noticed this with the 3 Day Courtesy Notices. There are messages like this in the mail logs that seem to correspond to templates with an empty To header:

2019-07-22 15:09:42 SMTP protocol error in "DATA" H=localhost (localhost.localdomain) [::1] valid RCPT command must precede DATA

The SendEmail reactor should check if there is at least 1 email-ish looking thing in the To, CC, and/or Bcc headers before attempting to deliver an email.

Otherwise, chained validators would be a cool thing.