Tag Archives: Exchange Online

Allegedly malicious notifications from teams through Defender ZAP

Posted on 2023-08-05 by guenni

[German]I would like to ask the administrators among the readership if anyone else is experiencing the effect mentioned here. An administrator contacted me because he has been getting reports of supposedly corrupt notifications from Teams for days. In use is … Continue reading →

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Exchange Online blocked emails (June 18, 2023)

Posted on 2023-07-18 by guenni

[German]Today, July 18, 2023, Microsoft's Exchange Online cloud service appears to have been experiencing a [partial] glitch since morning (8 a.m. UTM). German blog readers reported that emails are being blocked. There are various references to issues on 3rd party … Continue reading →

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How to find weak passwords in Active Directory and eliminate them with PowerShell

[Sponsored Post]Weak or compromised passwords are a known gateway for attackers. If you are able to identify which users in Active Directory (AD) are threatened by this, then PowerShell can help to remedy it. However, PowerShell scripts cannot eliminate basic AD deficits, other tools are needed for this. More ...

Exchange Online: Client Credential Flow for SMTP AUTH available (July 2023)

Posted on 2023-07-16 by guenni

[German]Quick addendum from this week: Microsoft's Exchange team has already announced the availability of Client Credential Flow (CCF) for SMTP AUTH in Exchange Online on July 10, 2023. Client Credential Flow (CCF) for SMTP AUTH enables applications to use modern … Continue reading →

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Exchange Online: Updated requirements for SMTP relay as of November 1, 2023

Posted on 2023-06-20 by guenni

[German]Quick note for administrators who use Exchange Online as an SMTP relay to send bulk email. Microsoft is adjusting the requirements for using SMTP relay functionality accordingly as of November 1, 2023. The company made the announcement in a June … Continue reading →

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Exchange Online down for hours (June 5, 2023)

Posted on 2023-06-06 by guenni

[German]As of June 5, 2023, Microsoft's Exchange Online seems to have experienced a massive disruption. Administrators could no longer get into the Admin Center and Outlook could no longer be reached on the web. A user alerted me to this … Continue reading →

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Exchange Online: Client Access Rules (CARs) supported until Sept. 2024

Posted on 2023-04-19 by guenni

[German]A short note for administrators who are responsible for Exchange Online in companies and have used Client Access Rules (CARs) so far. Actually, the support for CARs should expire – but Microsoft announced a few days ago an extension of … Continue reading →

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Issues with new 365 tenant/accounts – Migration Exchange 2013 to Exchange Online

Posted on 2023-04-08 by guenni

[German]This month, support for Microsoft Exchange 2013 expires, so administrators are facing a switch to Exchange 2019 or Exchange Online. A blog reader emailed me the other day because he ran into problems when migrating customers from Microsoft Exchange 2013 … Continue reading →

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Deprecated Remote PowerShell gets reprieve in Exchange Online

Posted on 2023-03-30 by guenni

[German]To force administrators of Exchange instances to the more secure PowerShell v3 modules, Microsoft plans to discontinue Remote PowerShell (RPS) in Exchange Online. It was supposed to be disabled for all customers starting June 2023 – and already on April … Continue reading →

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Exchange Online blocks mail from on-premises Exchange servers with vulnerabilities

Posted on 2023-03-28 by guenni

[English]Microsoft has just unveiled a new security policy for Exchange Online that can block the acceptance of email from insecure on-premises Exchange servers (in hybrid environments). The administrators in question will receive a notification that the on-premises Exchange server is … Continue reading →

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Thunderbird IMAP an oAuth connect issue with Exchange Online fixed

Posted on 2023-01-06 by guenni

Just a short note: It seems that Microsoft has fixed an issue, that prevents Thunderbird mail client to connect successful with Exchange Online using IMAP and oAuth2 (see my addendum at Thunderbird can't connect via IMAP an oAuth with Exchange Online … Continue reading →

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