Out of Band Bounces (OBB)

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Out of Band Bounces (OBB)

September 19, 2022
Posted by: Nicola Selenu

A bounce that occurs after the Simple Mail Transfer Protocol (SMTP) conversation has concluded.

For example, Server A sends an email to Server B, then Server B accepts the email and closes the connection to Server A. Server B later realizes it does not recognize the email address, so it then sends a bounce message to Server A.

Synonyms:

Out of Band Bounces, OBB, Asynchronous Bounces, Asynchronous Bounce, Out of Band Bounce

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Related Terms:

Term: Simple Mail Transfer Protocol (SMTP)

Author:Nicola Selenu

Nicola Selenu is a recognized leader in the Email Industry (with 15 years of professional experience as an Email Marketing and Deliverability Consultant) and an active member of the Anti-Abuse community. Some (of the many) brands that proudly served during his career in Email are: Adobe, Nestlé, Expedia, Gucci, Bulgari, Luxottica, UNHCR, Amnesty International, LastMinute, Acer, Groupon.

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