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In message <[email protected]
il.com>, Douglas Foster <[email protected]> writes

>    Consider the case of an environment with a single server, properly 
>    configured with SPF but without DKIM:
>    * Original messages from this server are considered authenticated 
>      based on SPF Pass with alignment, but
>    * Bounce messages from this server are considered unauthenticated 
>      because messages with a null sender require DKIM.

If MAIL FROM is null, SPF uses the domain in the EHLO

You should ensure you have an SPF result for that (noting that it may be
a subdomain and SPF does not have any concept of authoritative domains)

- -- 
richard                                                   Richard Clayton

Those who would give up essential Liberty, to purchase a little temporary 
Safety, deserve neither Liberty nor Safety. Benjamin Franklin 11 Nov 1755

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