In my contacts I have a contact with 2 email addresses in it. In Thinderbird android mobile, when I search for the contact name the 2 email addresses show in the To: form but if I delete either one from the address form the other deletes as well. In another email program I can choose which one I want. I tried just sending to both and it doesn't look like ir went, it didn't show up in my sent folder or outbox.

Is there a way to do this or is it an error in the program?