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According to various studies, spam emails account for over 50% of email traffic as a whole. This in turn means, that over half of the emails sent worldwide are messages that are actually unwanted. Spam emails can overload systems and contain malicious software or unwanted advertising. However, even legitimate and desired emails – such as your survey invitations or other messages from EFS – may be classified as spam. In the following, we will therefore give you an overview of how email is classified as spam and how you can check in the Mail report whether your email has been received by participants. In addition to that, we will show you some ways to ensure that your messages are less likely to be declared as spam and more likely to be delivered to participants.