7,424 questions with Exchange Online tags

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2 answers

Exchange Online: DKIM uses onmicrosoft.com instead of custom domain

We have an Exchange Online tenant using example.com as a custom domain. An outbound email has the following headers when it first reaches our email gateway: From:…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-10-03T15:35:49.5066667+00:00
Nguyễn Thành Nhân 0 Reputation points
answered 2026-10-03T15:54:22.4133333+00:00
Jayden-P 3,130 Reputation points Independent Advisor
2 answers

Restricted mailbox after sending to 120 recipients

We had a mailbox that was blocked from sending after a press email was sent to 120 recipients. This is below the 500 max recipient threshold so I want to know why it was restricted at all.

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-10-02T10:30:00.2566667+00:00
NAMT ICT 0 Reputation points
commented 2026-10-03T11:01:26.7766667+00:00
Kristen Tran 2,040 Reputation points Independent Advisor
1 answer

the shared email [Moderator note: personal identifiable Information removed]@magnet.co.uk when sending email doesnt show on sent items

the shared email [Moderator note: personal identifiable Information removed]@magnet.co.uk when sending email doesnt show on sent items

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-10-03T08:27:01.2133333+00:00
Begum, Tamanna 0 Reputation points
edited the question 2026-10-03T09:22:43.18+00:00
Daniel-Vo 6,610 Reputation points Microsoft External Staff Moderator
1 answer

Microsoft 365 tenant restricted from sending email (550 5.7.705) after compromised account was remediated

Our Microsoft 365 tenant is currently restricted from sending outbound email with the following error: 550 5.7.705 – Access denied, tenant has exceeded threshold. Microsoft Defender generated the following alert: "Tenant restricted from sending…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-10-02T15:02:39.9833333+00:00
AV 0 Reputation points
edited an answer 2026-10-02T22:07:46.17+00:00
Kai-L 19,920 Reputation points Microsoft External Staff Moderator
1 answer

How to create exchange mail user if that user already exsisit in entra id

I already have entra id users. But those users not visible in exchange admin under the contacts(Becasue email license not allocated those users) .So im unable to add those users to any group or distribution list. When i try to create mailuser contact in…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-10-01T19:53:14.8266667+00:00
Naveen viduranga 0 Reputation points
edited an answer 2026-10-02T17:53:00.21+00:00
Ruby Nguyen 2,800 Reputation points Independent Advisor
4 answers One of the answers was accepted by the question author.

Emails going into other tab

As of 2/2/26 all my new emails are now going into the "other" tab instead of the "focused" tab.

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-02-02T16:10:17.0533333+00:00
Jones, Linda R 45 Reputation points
answered 2026-10-02T07:46:17.95+00:00
Christiaan Venter 0 Reputation points
2 answers

Lost access to Microsoft Authenticator after phone change — need help restoring account

Hello, I recently changed to a new phone, but I forgot to transfer my Microsoft Authenticator data before switching. Now, when I try to log into Microsoft Authenticator on my new phone, I receive the following message: "**Unable to recover. Your…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2025-05-26T02:40:30.78+00:00
Xuerong Ma 30 Reputation points
commented 2026-10-01T21:15:04.59+00:00
2 answers One of the answers was accepted by the question author.

Unable to connect to Exchange Online Powershell

Hello, I am unable to login to Exchange Online Powershell using the following steps. I am a global admin and the Powershell is opened in elevated mode. I enter the code below Connect-ExchangeOnline -UserPrincipalName <mylogin> Then the login opens…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
Windows for business | Windows Server | User experience | PowerShell
asked 2023-10-27T14:39:42.4666667+00:00
Micael Ondoa 20 Reputation points
commented 2026-10-01T08:10:01.34+00:00
What 5 Reputation points
1 answer

Remote Server returned ‘550 5.7.708 Service unavailable (SMTP)

Hello, I am experiencing an issue sending emails from a Microsoft 365 / Exchange Online account. I have already tried practically every relevant configuration and troubleshooting step I have been able to find, but I continue to receive the same…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-30T16:43:32.99+00:00
Can Potes 0 Reputation points
edited an answer 2026-09-30T17:25:30.6066667+00:00
Kai-L 19,920 Reputation points Microsoft External Staff Moderator
4 answers

Exchange online error HTTP status 403 only on one account but not the other account

It was confirmed for both email address "EWS" enabled via Powershell script. One connect successfully but the other is still failing for about 8 hours since we updated policy. Is it possible that one could take longer to clear? I just…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-30T00:59:43.82+00:00
Young Park 0 Reputation points
answered 2026-09-30T16:29:33.03+00:00
Young Park 0 Reputation points
3 answers

Calendar Settings

Hi All, I have a shared mailbox, for example, smb1[@]mydomain.com When someone from our team creates a calendar event or meeting on the shared mailbox calendar, the meeting request appears to require acceptance before it is added to the calendar. We…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-27T19:35:50.58+00:00
Glenn Maxwell 14,206 Reputation points
commented 2026-09-30T07:25:49.6266667+00:00
Aetherin 2,505 Reputation points Independent Advisor
2 answers

How to Improve Spam and Phishing Protection for Exchange Online Users Without E3/E5 Licenses?

We have 10 Microsoft 365 users experiencing a high volume of spam and phishing emails. Users currently have standard Microsoft 365 licenses (no E3/E5). What are the recommended Microsoft best practices to Block spam, phishing, and spoofed emails? what…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-23T12:05:03.1033333+00:00
Muhammad Adeeb 40 Reputation points
commented 2026-09-29T14:09:49.94+00:00
Michelle Nguyen 1,835 Reputation points Independent Advisor
1 answer

External Guest User Unable to Add Room Mailbox Calendar Despite Organization Relationship and Limited Details Permissions

Hi everyone, I'm hoping someone can confirm whether this behaviour is expected or if there's additional configuration required. Scenario We have two Microsoft 365 tenants with calendar sharing configured between them. The calendar we are trying to share…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-28T12:11:15.21+00:00
Jose-Gabriel Gomez 0 Reputation points
answered 2026-09-28T13:48:18.3066667+00:00
Ruby Nguyen 2,800 Reputation points Independent Advisor
1 answer

Custom mail folders empty

Hello, I am experiencing a serious issue with my Exchange mailbox and would appreciate your assistance as soon as possible. Today, I discovered that all of my custom mail folders (Banks, Bills, Work, HFX, Lotto, J&B, TF, and others) became empty at…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-24T11:47:35.83+00:00
Mansour El Achkar 0 Reputation points
edited a comment 2026-09-28T01:39:22.0733333+00:00
Alina Le 5,495 Reputation points Independent Advisor
2 answers One of the answers was accepted by the question author.

DKIM in M365 - Mydomain.com vs Mydomain.onmicrosoft.com

Google reveals the title is taken from a Spiceworks thread. The question relates to an o365info article "Add DKIM and DMARC for onmicrosoft.com domain in Microsoft 365". Performing this in M365 will generate another set of DKIM CNAME…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-09-24T17:56:38.9433333+00:00
Laurie Stearn 151 Reputation points
commented 2026-09-25T17:47:15.0866667+00:00
Ivory 1,825 Reputation points Independent Advisor
1 answer One of the answers was accepted by the question author.

Get connection closed by remote host after executing Connect-ExchangeOnline PoweShell

Hello Team,   I've imported the Exchange Online PowerShell module to connect with the Exchange portal for performing Exchange-related activities. However, after MFA (Multi-Factor Authentication), we're encountering the attached response. Could you please…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2024-03-20T06:14:58.3766667+00:00
Pradeep Vaishya 20 Reputation points
accepted 2026-09-25T05:11:42.44+00:00
Pradeep Vaishya 20 Reputation points
1 answer One of the answers was accepted by the question author.

Enchange 2010 to Exchange Online migration - Migrating mailboxes used by applications

Hello, We are migrating an Exchange Server 2010 to Exchange Online. All user mailboxes were already migrated. There are 10 mailboxes that were used by server applications, using a Receive Connector with IP addresses cofigured for every source server.…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

8,202 questions
Exchange | Hybrid management
Exchange | Hybrid management

The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.

2,459 questions
asked 2020-11-26T22:11:29.267+00:00
Cristian Ruiz 191 Reputation points
commented 2026-09-24T21:20:54.1633333+00:00
Herald Johnson 0 Reputation points
2 answers

Email migration from One tenant to another of Microsoft

Need detailed steps to migrate emails which are 40 GB data each and 7 account from one MS Tenant to another, kindly suggest. Thanks

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2026-02-25T15:23:53.2+00:00
R Singh 40 Reputation points
commented 2026-09-24T21:16:29.07+00:00
Herald Johnson 0 Reputation points
1 answer One of the answers was accepted by the question author.

Exchange online migration

First time I work with exchange online, where I need to migrate a user account that today has a IMAP account. So overall I just look for best practise. Overall I need to change the MX record to point to Exchange online.  Then I need to migrate the imap…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
Exchange | Hybrid management
Exchange | Hybrid management

The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.

2,459 questions
asked 2024-10-09T00:27:04.01+00:00
Anthony-123 380 Reputation points
answered 2026-09-24T21:10:50.2566667+00:00
Herald Johnson 0 Reputation points
1 answer One of the answers was accepted by the question author.

exchange online migration

So have Two office 365 tenants  - that have to migrate, so it ends up in already existance of company-b.com Company/tenant = @company-a.com Company/tenant = @company-b.com So all company-a mailboxes must be migrated to company-b. What is the best way…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,424 questions
asked 2024-10-18T00:19:14.6666667+00:00
JohnNaguib 160 Reputation points
answered 2026-09-24T21:06:39.8966667+00:00
Herald Johnson 0 Reputation points