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Certified Senders Alliance (CSA)

As a sender of newsletters and advertising, we recommend that you participate in the Certified Senders Alliance (CSA). That allows you to ensure that your e-mails are less likely to be evaluated as spam and are not forwarded to the spam folder in the relevant 1&1 mailbox.

The alliance is a positive list project by the association Verband der deutschen Internetwirtschaft e.V. (eco) in cooperation with Deutscher Direktmarketing Verband (DDV).

This centralized positive list provides an interface between bulk e-mail senders and internet service providers with the aim of ensuring that desirable e-mails from trusted sources reach their targets without any trouble.

Another advantage of your participation is that successful delivery is managed for multiple providers.