[dmarc-discuss] multiple from

Roland Turner roland.turner at trustsphere.com
Fri Jul 19 00:39:15 PDT 2013


On 07/17/2013 07:57 PM, Douglas Otis wrote:

> On Jul 16, 2013, at 8:46 PM, Roland Turner <roland.turner at trustsphere.com> wrote:
>> An SMTP server (or the host that it runs on) is the property of a receiver. When a sender offers a message for delivery, the sender is asking the receiver to extend a delivery privilege, a privilege that the receiver is free to decline for any reason or for no reason.
> Respect the rights of receivers over that of senders? Absolutely!
> There remains a need to defend receivers, and that is a clear reality.

This is easy to say, but somewhat harder to think:

> SPF macros are a rarely used option, when combined with DMARC, becomes an obligatory role for receivers on behalf of senders.

Nothing is obligatory upon receivers. Indeed, any assumption that an RFC 
has this effect is invalidated by the actual behaviour of receivers 
above a certain size with respect to this particular feature, exactly to 
avoid the consequences of this error in the RFC.

- Roland

   Roland Turner | Director, Labs
   TrustSphere Pte Ltd | 3 Phillip Street #13-03, Singapore 048693
   Mobile: +65 96700022 | Skype: roland.turner
   roland.turner at trustsphere.com | http://www.trustsphere.com/

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