tester for spf and dkim
RealSender offers a free online check tool
to validate your SPF + DKIM settings sending an email message:
- send an email to spf@tester.realsender.com
- check online the SPF validation results at tester.realsender.com/spf
(it will take a minute to appear)
During verification, a prefix is added to the subject
if the message is not authenticated correctly.
Details on how it works
are located in the “email authentication basics” area of the website:
email authentication basics :: <spf> check online