List hygiene is a best practice in order to maintain a high sending reputation, deliver your messages more quickly and keep high deliverability rates.
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Subsequently, if the inbox of the recipient continues to be unreachable it will be classified as "permanently unsubscribed to further bounces."
Here is an example of how our algorithm works:
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The system automatically manages temporary delivery errors (Soft Bounces) that fall in the categories: SB, SBDF (Domain failure) and SBMF (Mailbox full) and other errors classified as Mail Block (MB*) temporally unsubscribing the recipient for a variable period of time, re-entering it later automatically. This process will be repeated several times until the recipient is definitively unsubscribed or the problem is solved.
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You can see which recipients have been automatically unsubscribed under Recipients > Email > Unsubscribed and selecting in the "Filter by" drop-down menu in the advanced search options area. Select in "Unsubscribe typeCause unsubscription":
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