Quanah Gibson-Mount:
> Imagine [email protected] e-mails [email protected], but bob has set up e-mail 
> forwarding to [email protected]
> 
> [email protected] -> [email protected] -> [email protected]

Standard scenario.

> But then... the e-mail is forwarded outside, to mx.bbc.com. 
> Because the envelope from address is not modified, mx.bbc.com will
> reject the e-mail because the SPF record tells it to: mx.zimbra.com
> is not permitted to send e-mail from example.com.

Did you mean: 
[email protected] -> [email protected] -> not([email protected]) -> [email protected]?
I don't see why that is revelant for this thread.

        Wietse

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