W dniu 2009-04-17 08:50, Kammen van, Marco, Springer SBM NL pisze:
Hi All,
We recently took over a company that used SPF.
Because our e-mail infra is way more complicated than theirs and we
have tons of external parties who send mails using our domains, we
decided long ago not to use SPF.
Now they say that %5 of their mailings don’t arrive at customers
anymore, and say this is because we removed their SPF records..
I’m no expert on SPF but as far as I understand it only checks if a
sender is ‘allowed’ to send using that domain, so no relation what so
ever on dropping mail from parties that don’t use SPF…
Or am I missing something?
It might be their IP's are on some blacklist and while they've had SPF
record their emails were not checked in (some) RBLs. There's no such
rule, but one can configure something like that.
Also it can be related to mail content, or amount of emails per piece of
time to the same server. You could think of SPF usage like some kind of
whitelisting, but that's dependent on one's configuration at client's
side (the side which uses SPF record, not the one provides it).
For sure there's no straightforward relation between not using SPF and
emails being rejected.
Maybe you've got some more information from logs why emails are being
rejected?
Pawel Lesniak
