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The Surveymonkey survey tools allow you to configure a FROM address on survey invitations that get sent out by e-mail which - you guessed no prizes for guessing- in our case is set to survey@terena<survey@terena.orgorg>.
Unfortunately the resulting e-mail is being sent with that very address as the envelop.
We publish SPF records with the "-all" flag (Allow domain's MXes to send mail for the domain, prohibit all others), so anyone that uses SPF is perfectly entitled to reject that mail.
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The real fix would be of course to always sent invitation e-mail using a surveymonkey.com envelope address, and use the customer provider e-mail address as FROM address in the headers.
If you are a Surveymonkey employee and you are reading this, I can summarize this story: you're loosing revenue if you don't fix this.
