On Mon, Apr 21, 2025, at 13:29, Allen Robinson wrote: > Without at least these two distinct addresses, the message is presumably > being generated with the intent of being delivered to the address that > received it. While technically one could redeliver a message to the same > address many times, IMO this style of abuse has far less value, so there's > less motivation to try to prevent it.
More to the point, redelivering a message to the same address is a deliberate possible outcome of the "at-least-once" design of SMTP delivery. A dropped connection between the receiving system returning its final OK and the sending system seeing it will cause a redelivery; so you already need to do de-duplication and it's not a sign of abuse to receive a message more than once. Bron. -- Bron Gondwana, CEO, Fastmail Pty Ltd [email protected]
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