Blowback, Backscatter, Misdirected Bounces

Delayed bounces, virus notices, out-of-office messages and other forms of auto-responses that are frequently mis-directed, basing their targets on data found within forged header lines. In the past, these types of notifications were a nicety. However, as the spammers have once again used a "feature" of something developed under the "trusted users" model to aid in delivering their spew, this activity of e-mail servers has moved into the "bad"zone. It is more desirable these days when non-deliverable e-mail (NDR)∞ is handled at the time of attempted delivery, such that any rejection notice required is supplied to the sending server, rather than a possible innocent third-party.

Also see:

• spamcop FAQ:Why are auto responders bad?∞
• Bounce - a more detailed explaination of the subject
• MisdirectedBounce - written to address the concerns of mail admins
• VacationResponders

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