New warning message...

Chris Buxton clists at
Mon Jul 22 22:05:18 UTC 2013

On Jul 22, 2013, at 1:24 PM, Barry S. Finkel <bsfinkel at> wrote:

> On 7/22/2013 11:17 AM, bind-users-request at wrote:
>>>> This was discussed here already, and imho this is anti-spf bullshit like
>>>> >>all those "spf breaks forwarding" FUD. The SPF RR is already here and is
>>>> >>preferred over TXT that is generik RR type, unlike SPF.
>> On 22.07.13 08:50, Barry S. Finkel wrote:
>>> >It is not Fear, Uncertainty, and Doubt that "SPF breaks forwarding".
>>> >SPF*DOES*  break forwarding.
>> No, it does not. If a mail gets delivered to address, which is sending it
>> further ("forwarding it"), the envelope sender has to be changed, because
>> it's not the original sender who sends the another mail.  Forwarding without
>> changing envelope address is already broken, it's just people don't care
>> without SPF.
>>> >  I have a case I am researching right now
>>> >where forwarded mail is undeliverable due to SPF checking at the
>>> >new destination.
>> Rewrite the sender's address. You have more choices, SRS is one of them.
>> -- Matus UHLAR - fantomas, uhlar at ;
> I have no control over what my Mail User Agent does. And a quick reading
> of section 3.6.6 of RFC 5322 does not tell me what is the correct action
> on a forwarded message:
>     1) Change the "From:" address, or
>     2) Keep the "From:" address.
> My MUA, Thunderbird, does 1).  And I do not see any configuration
> option.  I am not sure which action is "correct".
> I do not know what implications for forwarding SMTP (RFC 5321) has.

Do not be confused by the From: address shown by your mail client. That is not the envelope sender.


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