Tag Archives: Exchange Online

Exchange Online Delicensing Resiliency: Protection against unintentional delicensing actions

[German]Microsoft introduced the "Exchange Online Delicensing Resiliency" feature in Exchange Online at the beginning of November 2024. This allows administrators to protect Exchange Online mailboxes from unintentional de-licensing by granting a 30-day grace period for license removal. Here is some … Continue reading

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Exchange Online: IPv6 Update

[German]Microsoft has supported IPv6 in Exchange Online for outgoing email for some time now and also prefers this for data traffic. In a Techcommunity post dated October 30, 2024, the Microsoft team has now summarized the changes to IPv6 support … Continue reading

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Exchange Online: Inbound SMTP DANE with DNSSEC available

[German]Microsoft has generally released Inbound SMTP DANE with DNSSEC for Exchange Online, after it was already available as a preview in July 2024. The new Inbound SMTP DANE with DNSSEC function in Exchange Online is intended to increase the security … Continue reading

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Exchange Online: Basic authentication for client transmission (SMTP AUTH) ends Sept. 2025

[German]I'm adding a topic to the blog that was announced by Microsoft back in April 2024, but hasn't yet received too much attention. A reader had already pointed this out to me some time ago. Microsoft will finally discontinue support … Continue reading

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Exchange Online: Microsoft confirms outgoing emails are rejected as spam (March 2024)

[German]Microsoft has a problem with its Exchange Online instances that can easily sideline its customers. The sender domains for emails are classified as spam and rejected. This means that companies can no longer send mail. After I discussed this several … Continue reading

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Troubleshooting Exchange Online transport rules – new cmdlet "Test Message"

[English]A little tip for Exchange Online administrators. What to do if issues occur when processing mails due to mail flow rules. The options for tenant administrators were previously limited, and Microsoft support often had to be called. Microsoft has now … Continue reading

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Exchange Online issue (EX694090) from 28, – 29, Nov. 2023 fixed

[German]Microsoft's Exchange Online experienced a malfunction (EX694090) on November 28, 2023, during which the service was no longer  functional. Users were unable to receive emails via Exchange Online. However, Microsoft is trying to resolve the problem by redirecting mail deliveries. … Continue reading

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Exchange Online blocks suddenly mails from on-premises Exchange servers

[German]A quick question for Exchange Online administrators. A reader reports problems with the delivery of mails that are delivered from on-premises Exchange servers. Since the November 2023 patchday, these are supposed to be moved directly to quarantine after acceptance. The … Continue reading

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Exchange Online: Missing confirmations for rooms bookings

[German]Currently users are facing many issues with Exchange Online. German blog reader Georg emailed me yesterday (October 25, 2023) about an annoying bug in Exchange Online: They don't get any confirmations / rejections sent for rooms bookings in Exchange Online … Continue reading

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Exchange Online show foreign address lists (GAL) – a GDPR violation

[German]A reader pointed out to me a strange and dubious behavior of Exchange Online. It has been observed that users are offered global address lists (GAL) from other tenants as soon as people try to fill out the To field … Continue reading

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