How-to / Guides
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Direct Send in Exchange Online: How to safeguard your outbound email traffic
Read moreUsers have long been familiar with Exchange Online’s “Direct Send” option. In our customer projects, however, we have recently noted an increase in configurations that allow for unintended or undesirable mail flows. Setups established over time often remain unchanged for extended periods, posing risks regarding security, compliance, and control.
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Exchange Online and the “ghost senders”: Five tips you should implement right now
Read moreFor the past few days, news reports addressing the topic of ghost senders have been sparking debate among email administrators and decision-makers. As established experts in email security and business-critical communications infrastructure, Retarus has summarized and analyzed the key details behind Microsoft’s latest headline-grabbing issue for you.
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Trusted Domains: Ensuring that transactional emails reach only their intended recipients
Read moreRetarus Transactional Email allows you to define a list of allowed recipient domains. This ensures that messages are only delivered to approved organizations; any emails accidentally sent to domains not part of that list will be dropped.
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Ready for France: Why Choosing the Right E-Invoicing Partner Is Critical
Read moreStarting September 1, 2026, e-invoicing will become mandatory for B2B transactions in France. What many underestimate: time is running short – and the requirements are complex. That’s why it’s critical to involve the right stakeholders early and have a strong partner in place.
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Advantages of an Enterprise-Level Cloud SMS Solution
Read moreThe adoption of cloud-based messaging solutions offers numerous benefits, ranging from scalability and cost-effectiveness to enhanced delivery rates and global reach. For large businesses, it is essential that they have a reliable enterprise-level solution for their critical messaging.
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Christmas Season in Companies: 5 Tips for Better Email Security
Read moreThe run-up to Christmas is the most wonderful time of the year for many people – unfortunately, it is for cybercriminals as well. While companies focus on closing the fiscal year and employees are busy with vacation planning and gift shopping, attackers prepare targeted campaigns. Sören Schulte, email security specialist at Retarus, explains what IT…
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GraphQL API: Real-Time Data Insights Where You Need Them
Read moreDid you know? You can use our GraphQL Reporting API to get real-time data on your critical fax transmissions wherever you need them.
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Six factors companies need to consider when selecting an e-invoicing provider
Read moreImplementing e-invoicing requires companies to make strategic decisions that will have a long-term impact on efficiency, compliance and costs, in addition to meeting regulatory requirements. The mandatory requirement for companies in Germany to be capable of receiving e-invoices in B2B commerce from 2025 has left many companies facing the challenge of finding a suitable e-invoicing…
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7 Reasons for using XRechnung
Read moreXRechnung, a standardized invoicing format originally developed for public sector billing, is now also gaining in importance in Germany among companies in the B2B sector. But why should companies make the transition to XRechnung? Here are the main reasons.