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Terms
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
5 IPv4 addresses
or else
include:
spf.u2d.de
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
-all
fail
the email's SPF check.