In the 'send mail.' options 'email to' if I enter a global with one email address it mails successfully. If the global contains more than one email address . . . email@example.com; firstname.lastname@example.org for example I get the 1506 error message.
I can enter the two email addresses manually in the' email to' and it sends both correctly.
Not sending to a found set, just sending a message to several email addresses.