Now, Gmail and Yahoo have new email deliverability rules for mass senders, and mandatory list-unsubscribe is one of them. Email senders have to include list-subscribe headers in their messages and honor unsubscribes within two days.
List-unsubscribe is insurance against those frustrated spam clicks, but that isn't the only way it helps marketers: Minimize your spam complaint rate, adhere to Gmail and Yahoo sender requirements for deliverability, optimize engagement and performance by sending only to interested subscribers, potentially reduce email marketing costs by routinely cleaning list size, end subscriber relationships on a positive note.
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