Jasper Bryant-Greene wrote:
On Aug 27, 2007 09:30:00, TreeNet Admin wrote:
Another problem many may or may not be aware of is that if you're a email provider and the clients mail is accepted by your server then forwarded to their xtra address, the yahoo mx accepts the mail and then it's gone. So if any of your clients have email forwarders pointing to xtra, they DONT work :/ That would most likely be their DomainKeys sender policy getting in your way. I have not had any problem with forwarding to Xtra since reconfiguring my mailer, to enforce setting the envelope sender during a forward to the redirecting email address (which their mailer can authenticate authority for). That was setup to cope with forwarding under SPF.
You're talking about SRS, a rewriting scheme to allow forwarding to work with SPF, which is a policy framework for specifying MTAs who may send mail for your domain.
Neither are even remotely related to DomainKeys, which is a standard for signing outgoing mail using a private key whose public counterpart is published in DNS, to prove the message's integrity and identify its source.
I am well aware of all three and their operations. DomainKeys can break when messages are relayed through any form of filter that appends text (including AV or spam filters) or in my case strips executables. Whereas SPF breaks when the sender and mailer do not match. SRS is a solution to both as the relevant tests become for the relay keys (if any) not those of the origin source. AYJ