RE: Re[2]: Help - How to unwind an SRS address?

 -----Original Message-----
 From: [email protected]
 [mailto:[email protected]] On Behalf Of Chris Drake
 Sent: zondag 21 november 2004 0:45
 To: Meng Weng Wong
 Subject: Re[2]: [srs-discuss] Help - How to unwind an SRS address?

 Hi All,

> I must admit surprise that nobody seems to know how to do this
> already;

I think we pretty much covered all cases of the SRS appearances
for you. :)

> doing basic checks on the purported sender is a fundamental
> element of email!!!

I have never had the need to determine the pre-rewritten sender in
a foreign SRS address, yet. Any foreign SRS entity can be checked
"as is" (for callbacks and such, if you had those in mind). In fact,
'unrolling' them first, and then do remote checks on them, may even
be worse.

>  Anyhow, from what I can glean from the docs, from
> inspection, and from your comments, it looks like... this might do it,
> at least for now.  Only problem is that from inspection, "+" seems to
> be interchangeable with "=", while from looking at marks code "-" also
> seems interchangeable with it,

Only as 'separator' character after SRS[01]. After that, "=" remains "="
('=' = '=', so to speak), and cannot be replaced with anything else.

> If anyone wants to stick their hand up and state unambiguously that
> specific elements of SRS rewritten addresses are separated by one and
> only one specific character (and which), I'd be grateful:

We already did that. :)

- Mark 
 
        System Administrator Asarian-host.org
 
---
"If you were supposed to understand it,
we wouldn't call it code." - FedEx