Quanah Gibson-Mount:
> Imagine al...@example.com e-mails b...@zimbra.com, but bob has set up e-mail 
> forwarding to char...@bbc.com
> 
> al...@example.com -> b...@zimbra.com -> char...@bbc.com

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: 
al...@example.com -> b...@zimbra.com -> not(???@bbc.com) -> char...@bbc.com?
I don't see why that is revelant for this thread.

        Wietse

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