Tag Archives: Mail

Mozilla's Thundermail and Pro as an alternative to Gmail and Office365

Posted on 2025-04-16 by guenni

[German]Exciting information that became known at the beginning of April 2025. Mozilla wants to introduce Thundermail and Pro services. The aim is to offer an open source alternative to Gmail and Office365 that focuses on data protection, reducing dependencies and … Continue reading →

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Outlook: New requirements for bulk emails

Posted on 2025-04-12 by guenni

[German]In future, Microsoft will specify new requirements for sending bulk emails in Outlook. For domains that send more than 5,000 emails per day, Outlook will soon require compliance with SPF, DKIM and DMARC. Non-compliant messages will initially be sent to … Continue reading →

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Solution for no access to Microsoft 365 mail account via Samsung Mail app

Posted on 2025-03-29 by guenni

[German]There have been massive problems with Microsoft 365/Exchange Online since March 2025. And some readers and users are complaining that access to mailboxes via the Samsung Mail app is not working. A blog reader sent me a "spooky" solution to … Continue reading →

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Does Outlook.com store attachments in OneDrive? Microsoft 365 will use OneDrive from March 2025

Posted on 2025-03-25 by guenni

[German]One of my followers on Mastodon recently pointed out to me that emails with attachments sent via outlook.live.com are "unintentionally" saving these attachments in OneDrive. Has anyone else noticed this? I then did some research and found that there was … Continue reading →

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EX1038119: Exchange Online quarantines mails (21.3.2025)

Posted on 2025-03-21 by guenni

[German]Short message for Exchange Online administrators. If no mails were delivered or messages ended up in quarantine as of today, March 21, 2025, it is not due to the tenant. Microsoft has posted a message in the Microsoft 365 Admin … Continue reading →

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Outlook.com service disruption continues on March 13/14, 2025

Posted on 2025-03-14 by guenni

[German]There is no end to the disruption of the Microsoft cloud service outlook.com. Since March 1, 2025, the cloud services (Exchange Online, outlook.com, outlook.de etc.) have been experiencing repeated outages. The status is also disrupted on March 13 and 14, … Continue reading →

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What is behind DKIM, SPF and DMARC?

Posted on 2025-01-01 by guenni

[German]Email security for Security Operations Center (SOC) teams. What is hidden behind terms such as DKIM, SPF and DMARC, which are used to secure email communication?

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Does Microsoft Exchange Online change the e-mail sender?

Posted on 2024-12-26 by guenni

[German]I'm posting an observation from a German blog reader that relates to Microsoft's Exchange Online. The reader is confronted with the problem of complaints from business partners about emails that have not "arrived". There is a suspicion that Exchange Online … Continue reading →

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Prevent migration from Classic Outlook to New Outlook

Posted on 2024-12-09 by guenni

[German]Microsoft plans to switch certain Microsoft 365 user groups from Outlook Classic to the new Outlook app from the beginning of 2025. Some people has developed remediation solutions to prevent this. Here is a solution I came across yesterday.

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Email bombing: A new spam campaign? Or a cover-up for a (black basta) attack?

Posted on 2024-11-29 by guenni

[German]A German blog reader recently shared an observation from his IT department with me. An employee was bombed by a veritable wave of spam  mail (more than 1,000/hour). All the emails had some kind of confirmation for a registration, which … Continue reading →

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