<spf> check online

spf logo

  1. send an email message to:
spf@tester.realsender.com
  1. check online the SPF validation results:
    (it will take a minute to appear)
https://tester.realsender.com/spf

RealSender SPF check online will add a subject prefix, if the message has not been authenticated correctly:

!! spf-fail !!       the smtp server is not listed among the authorized ones
                      and the email should be rejected or discarded
!! spf-softfail !!   the smtp server is not listed among the authorized ones
                      but this case should be treated as a "softfail"  
!! spf-neutral !!    the SPF record specifies explicitly that nothing can be said about validity  
!! spf-none !!       the sender domain contains no information to authenticate the email

Sometimes the information recorded at domain level is not correct/understandable.

!! spf-permerror !!  a permanent error has occurred (eg. badly formatted SPF record)  
!! spf-temperror !!  a transient error has occurred

SPF check is made against the “Mail-From” email address, that is hidden in the email headers.
Only the “From” email address is visible. If their root domains are different, this warning is displayed:

!! spf-diff !!       the "Mail-From" and the "From" root domains are different

If the message passes both SPF check AND SPF alignment check for DMARC (relaxed alignment), you will get:

|OK| spf-pass        your email passes SPF check + SPF alignment check

If only one, SPF OR DKIM, passes the alignment check for DMARC (relaxed alignment),
the message is still considered “OK” (trusted) and the ~ (tilde) symbol is added at the beginning:

|~OK| spf-pass       your email passes SPF check (not the alignment) + DKIM alignment check

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