15 lines
668 B
Text
15 lines
668 B
Text
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The Sender Rewriting Scheme preserves .forward functionality in an
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SPF-compliant world.
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SPF requires the SMTP client IP to match the envelope sender
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(return-path). When a message is forwarded through an intermediate
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server, that intermediate server may need to rewrite the return-path to
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remain SPF compliant. If the message bounces, that intermediate server
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needs to validate the bounce and forward the bounce to the original
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sender.
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SRS provides a convention for return-path rewriting which allows
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multiple forwarding servers to compact the return-path. SRS also
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provides an authentication mechanism to ensure that purported bounces
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are not arbitrarily forwarded.
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