Subject: When SPF is incompatible with Sender-ID

From: Tony Finch <[email-masked]>
Date: Tue, 10 Aug 2004 20:10:47 +0100

You can use SPF records and a custom DNS server to allow SPF-aware
recipients to verify signed envelope return paths using the exists
mechanism. This SPF record does not work for Sender-ID because the PRA
will not be signed so will FAIL.

Tony.
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