Doug,
On 07/17/2013 07:57 PM, Douglas Otis wrote:
On Jul 16, 2013, at 8:46 PM, Roland Turner <[email protected]>
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
[email protected] | http://www.trustsphere.com/
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