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Adaption is using outbound.mail.cloud-mail.nl server for sending emails (193.202.23.98) if a customer uses SPF rules they need to adjust the SPF settings 
to solve this they needs to adjust there SPF setup or disable it or implement SRS 

More info can be found at

http://www.open-spf.org/srs/
http://www.open-spf.org/Best_Practices/Forwarding/