Hello Barryshapiro,
Thanks for your prompt reply. As I mentioned in my last reply, we cannot recall the message that you sent to the Gmail recipient.
However, as the Gmail user received two emails from you, a possible reason is that you selected the option “Delete unread copies and replace with a new message” when trying to recall the message.
If this is your case, then based on my test result, the Gmail user will only receive the current two emails and will not receive any further messages.
Best regards,
Jennifer