September 4, 2015
New CSA ISP: Unitymedia

Unitymedia joined the Certified Senders Alliance (CSA) as official Internet Service Provider in August 2015.

Unitymedia is the largest cable network providers by turnover and one of the leading providers of media and communication services in North-Rhein Westphalia, Hesse and Baden-Württemberg. It has been a subsidiary of Liberty Global plc. since 2009 and has its headquarters in Cologne.

With one of the most modern and largest continuous cable networks in Europe, Unitymedia serves 12.7 million households and offers digital and analogue TV and radio services, telephone services, and internet connections of up to 200 Mbit/s. The trade journal Connect (8/2014) rated Unitymedia’s telephone and internet connections as “excellent”.

Unitymedia joined the CSA for several reasons. Increased Spam filtering possibilities cause lower operational cost and more satisfied users at the same time. In addition Unitymedia highy appreciates the basic idea of the CSA: The commitment of the senders to high quality e-mail sendings.

July 16, 2015
New CSA Partner: Kaspersky Lab

Kaspersky Lab is, from June 2015, Official Technology Partner for the Certified Senders Alliance (CSA). The CSA Whitelist is used in Kaspersky anti-spam products in order to improve the false-positive rate. For users of the Kaspersky anti-spam products, this means that wanted emails arrive in the inbox, while a stronger anti-spam filter takes care of blocking spam.

Kaspersky Lab is the largest private provider of cybersecurity solutions, and can look back at around 18 years of anti-malware expertise. Kaspersky Lab’s technologies protecting 400,000,000 users in more than 200 countries and territories.

The security product Kaspersky Internet Security 2015 was awarded Test Winner this year by the magazine ComputerBILD in Germany.

July 1, 2015
Report on the compliance of DMARC with German law

ISP`s want to protect their users but are facing increased phishing attacks at the moment. Hence they are extending the search for trusted sources in order to identify the right sender of an email. Having identified the right sender simplifies their decision of blocking or delivering an email. With the implementation of DMARC email senders can make sure that their identity will not get misused and their reputation harmed by a third party: DMARC protects brands and Email Service Providers.

However, the establishment of DMARC also raised a number of legal questions and concerns, particularly within the ISP community. The expert team of eco has addressed these issues and created a detailed legal report. The report covers relevant fields of law and discusses data protection issues particularly.
Read why and under what circumstances the implementation of DMARC is legally compliant.

Download here


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Claudia Schönberger
Office Manager


Rosa Hafezi
Legal Consulting and Certification

Ivo Ivanov
Director CSA

Julia Janßen-Holldiek
Manager Business Development & ISP Relations

Alexandra Koch-Skiba
Complaints Manager

Maike Marx
Marketing Assistant & Business Development

Qadir Rostamzada
Marketing Assistant & Business Development

Peter-Paul Urlaub
Consultant Complaints Office

Alexander Zeh
Engineering Manager

Get in touch with us if you are interested in participating in the Certified Senders Alliance. Find our contact details alongside.

Just let us know if there are any questions left!
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Please let us know by submitting the email including full headers to to help us ensure the quality of the Certified Senders Alliance. We take the measures necessary to clear up the underlying facts, and sanction violations of the regulations of the Certified Senders Alliance.