Re: Question abour SRS in sendmail

On Tue, Jul 19, 2005 at 10:08:50AM -0300, Fernando Trindade Xavier - Fumsoft wrote:
>     I've read about the Mail SRS and the problem of the forwarded
> e-mail. I thing I got this problem. Some accounts in my server needs to
> be forwarded to anothers accounts, and that servers wich have spf
> records are rejecting these forward e-mail's. I guess that the solution
> is rewriting the sender address, but how can I do that in sendmail ???

Aside: first you might want to consider whether you ought to be breaking
*your* mail system, in order to get mail through to someone else's broken
mail system.

If A and B wish to communicate, but B's mail system rejects mail from A,
then generally the suffering is roughly equal for A and B. If B broke
things, and A is complying with the agreed standards for Internet E-mail,
then it can be argued that B should fix it.

The recipient (B) also has the option of changing to a different E-mail
account, either just to receive mail from A, or abandoning their old
provider altogether, if the old provider won't fix things.

If you are running the mail system at A: you should make it very clear to
your user/customer that your mail system is behaving correctly, and it is a
policy choice at B which is rejecting the mail.

If yuo are running a mail system at X, and A is sending to X which is
forwarding to B: then it is a policy choice at A (to advertise SPF records
which forbid forwarding via a third party) combined with a policy choice at
B (to reject mail based on advertised SPF policies).

If you fight SPF, you may help in a small way towards bringing forward its
demise.

Regards,

Brian.