Add marketing automation type for newly subscribed customers

[victoriabeautie]

Feature Request: Add a new marketing automation hook type for customers who have just subscribed to marketing.

For example, a customer who completes the contact form could subsequently receive an email thanking them for doing so. This would be useful for creating a transactional model where a customer receives a personal message with a special offer, link, or coupon in exchange for opting into marketing emails.

[DinaLRosenberg]

that's a great idea for an automation I can't believe it doesn't exist!