Replace the ten old addresses with 10 new phony addresses

[emailjoe]

Replace those ten old addresses with ten new ones- and they can be phony like a@a.com, and a@b.com and a@c.com and put them in the Person field as well as the To field.  When you push send you'll get a message 'Failed to create sample email record' (I guess because they're not in your marketo contacts).  then that address will be in the list- having pushed an old one out.  Repeat 9X and you'll have a bunch of phony, short addresses int eh send autofill that can't cause you problems.  You could probably also use a random hash like a@3a23608cc39fa96b98ca1c0ff4cc1694.com.  if you are concerned about actually email a real person on accident.  It won't send anyway. (google random hash generator)
 

[Darshil_Shah1]

This is a cool hack and thank you for sharing this! The only downside of this is that you'd still be left with phony email addresses in the drop-down until you send real test emails to 9 genuine people. I think until removing email addresses gets added as a feature, people could decide whether they want to see the real-invalid email addresses of people that left or phony email addresses. 🙂