> This will provide positive benefits, without having any
> negative benefits.
>
> If you know a domain will only be sending mail through your
> mailservers, you can instead use "-all" at the end (which
> gives a FAIL result for E-mail sent from other IPs).
Ok, thank you for this information.
But I have to know in any case of all the domains that send out legit
messages trough our server.
Is there any way to gather this information from already present logfiles
(smtp, declude jm, ...) ?
If not: Would it be possible to have something like
LOGSPFINFO ON
that can be enabled temporary for some days to write one line for every
outgoing message. (eventually also in a separate logfile)
Then we can uniq and sort this list and know about all domains where we can
add safely the SPF TXT records.
Markus
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