As a member of the CSA (www.certified-senders.org), we adhere to certain juridical and technical quality standards. In return we profit from the so-called Whitelisting. The CSA describes the function of whitelisting as follows:

“Mailbox providers want to achieve the highest possible level of user satisfaction, but they face a challenge:
They need to protect their users from unwanted emails and, at the same time, guarantee that wanted emails are delivered. To protect their users from spam, mailbox providers set their filters to be very restrictive. However, this can lead to wanted messages being filtered out and erroneously classified as spam, and therefore not being delivered to the receiver.

Given that the IP addresses of CSA-certified senders are on the CSA whitelist and mailbox providers can access this whitelist, CSA senders are recognized as serious email senders. As a result, their messages will be delivered more effectively by the participating mailbox providers.”