How can you best protect yourself against the flood of spam in your email inbox? Various methods allow harmful or unwanted messages to be placed on blacklists. But what if you find yourself on a spam blacklist? How can you get off it—and how can you prevent ending up on an email…
What exactly is an SMTP relay, and how does it differ from a smarthost or open mail relay? This article provides a detailed explanation of how SMTP relay servers work, their purposes, and the important role they play in email delivery, security, efficient communication, and…
Spectral-DesignshutterstockIf you’re involved with email delivery technology, you will come across the term SMTP server. But what exactly is its crucial role behind the scenes? How does it make sure emails reach their destination reliably and promptly? Understanding this helps in managing email systems…
CalDAV is a network protocol that enables you to sync calendar data, such as appointments and meetings, across devices like your PC, smartphone, or tablet. These events are stored in the iCalendar format and managed within a WebDAV environment. In this article, we explain what…
If an email cannot be delivered, the server sends back an error message along with an SMTP code. The message “550 Requested action not taken: mailbox unavailable” means the recipient’s address is unavailable. The causes for this are varied, and so are the potential solutions,…
To ensure that your newsletter campaigns continue to be effective in the future, you shouldn’t miss out on these email marketing trends in 2025. There are even more automation possibilities, new design options and stricter data protection. In our article on this…
optimarcShutterstockNot just in the business context, but also among individuals, Microsoft’s Office packages are popular. These are available either as a one-time download or with Microsoft 365 in a subscription model. We’ll show you what Microsoft 365 exactly is. Additionally, you’ll get an…
Microsoft programs like Word, Excel, and PowerPoint are essential in the modern work environment. However, many private users cannot afford a paid Microsoft subscription, or may not need a full version for occasional tasks. Learn how to use the standard Microsoft 365 programs for…
BEST-BACKGROUNDSShutterstockMeta tags serve website operators by providing metadata in HTML documents. The encoded information interacts with web browsers and search engine crawlers and is therefore responsible for the searchability of the World Wide Web. But which meta elements are actually needed and how…
The security of cloud services like Dropbox relies on two key factors: the level of data protection provided and the access rights granted. While Dropbox implements several advanced security features, it also has some security vulnerabilities. In this article, we cover everything…