-----Original Message-----
>From: Thomas Walter via mailop <mailop@mailop.org>
>Sent: Dec 10, 2020 2:26 AM
>To: mailop@mailop.org
>Subject: Re: [mailop] Effeciveness (or not) of SPF
>
>Hey Brandon,
>
>On 09.12.20 00:55, Brandon Long via mailop wrote:
>>
>> On Tue, Dec 8, 2020 at 1:31 AM Paul Smith via mailop <mailop@mailop.org
>> <mailto:mailop@mailop.org>> wrote:
>> If you're forwarding to your own company's mail server, then it should
>> be easy to have that forwarding work with SPF, and if you're forwarding
>> to someone like gmail, then, to be honest, it should be relatively
>> trivial for them to *USE* SPF to allow forwarding to them. I could tell
>> Google to allow a specific domain to forward to me (the domain of the
>> forwarder), and they use the SPF record for that domain to validate the
>> IP addresses that can then forward and override other SPF checks.
>>
>>
>> That feature was on my backlog at Gmail for a long time, but never high
>> enough priority
>> to get off it... now it would probably use ARC instead unless that
>> becomes a pipe dream,
>> at least theoretically with ARC we could just learn it and not worry
>> about the user interface
>> and confusing users.
>Interested question: Your systems could learn something like that too?
>
>If a number of emails come in to the same recipient with "failing" SPF
>from the same host(s)/domains it is probably a forwarder to that recipient?
>
>Regards,
>Thomas Walter
>
>--
>Thomas Walter
>Datenverarbeitungszentrale
>
>FH Münster
>- University of Applied Sciences -
>Corrensstr. 25, Raum B 112
>48149 Münster
>
>Tel: +49 251 83 64 908
>Fax: +49 251 83 64 910
>www.fh-muenster.de/dvz/
>
SPF plays havoc with forwards unless the sender is rewriting their
envelope from addresses to a domain with SPF friendly to their
source.
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