Imagine this scenario:
1. Person A is listed in your Marketo database as firstname.lastname@example.org.
2. Person A unsubscribes.
3. Company.com gets acquired; now all their emails are email@example.com
4. You update Person A's email address to keep good hygiene--maybe sales will do a one on one email with them sometime.
5. Marketo sees the email address change and re-subscribes Person A.
While I would expect flags to be reset on say, invalid email, with an email address change, the Unsubscribe field is almost always used as a person-centric way of noting whether to mail someone or not. By resetting this field by default, you wind up emailing Person A when they've already told you they don't want to receive anything. Current Marketo behavior automatically re-subscribes the person and requires you to create a Smart Campaign to fix this. This should be the other way around; if you want to re-subscribe someone who's unsubscribed, you should have to do that through actions.
Please change this behavior so the record stays unsubscribed.
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