spfdiscuss at alandoherty
Mar 30, 2010, 10:53 AM
Post #3 of 4
(686 views)
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all forwarders should do SRS
additionally all receivers should provide a method for users to whitelist all their non-srs forwarders
as they will never disappear entirely {as many products like for example exchange do not do srs {or even any form of sender-id compliant forwarding} despite encouraging users to use it for filtering their incoming mail}
the receiver whitelisting is also much less complex {assuming the forwarder checks spf before receiving the original}
unfortunately few big receivers offer such an option {though always a good way to encourage users to pick a better end-point for all their various email sources}
At 14:50 30/03/2010 Tuesday, Andrew Culver wrote:
>Dieter Guthmann wrote:
>> Is the only way to solve this to force all hosters all over the world to
>> implement SRS?
>
>Only those that are acting as forwarders would need to implement SRS or
>some form of sender rewriting. Mail forwarders would run in to SPF
>problems when delivering mail from any domain with an SPF record, not
>just yours. If they want to continue to forward mail successfully, they
>need to get their heads out of the sand.
>
>If this is a very specific case where you want to send messages to
>domainB which forwards to domainC, you could ask domainC to skip SPF
>checking for domainB's hosts, or you could include domainB's hosts in
>your domain's SPF record. Obviously, these solutions don't scale well,
>and I would only recommend them if this is how your domain normally
>sends mail.
>
>Andrew
>
>
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