Exchange online subdomain, example. g. ) but can’t find how to do this with M365/Exchange Online. Mar 13, 2020 · At least one Microsoft Exchange Edge Server An SSL certificate to encrypt mail flow between both Exchange Online tenants and the Microsoft Exchange Edge Some important notes about the requirements: my tenant vanity domains are sub domains of the shared vanity domain, but that is not a requirement. To get the required values for your custom domains or subdomains, use the procedures later in this article. Sep 21, 2022 · How to add email sub-domain to Exchange Online Hi I've been asked to add a sub-domain to our M365 tenant, this sub-domain will only be used for email and then only for a couple of our mailboxes. mail. I did this in Google Workspace relatively easily (and it prefilled the domain etc. To connect to Exchange Online PowerShell, see Connect to Exchange Online PowerShell. Nov 1, 2021 · I’m simply trying to set up the “mail” subdomain to go M365, e. For example, if you have an accepted domain called Contoso. Thanks May 7, 2025 · Learn how to configure Domain-based Message Authentication, Reporting, and Conformance (DMARC) to validate messages sent from your organization. 3 days ago · Need detailed steps to migrate emails which are 40 GB data each and 7 account from one MS Tenant to another, kindly suggest. Sep 17, 2025 · Learn how to update a Domain Name Service (DNS) record to use Sender Policy Framework (SPF) with your custom domain in Office 365. Entry limits for domains and email addresses: Microsoft 365 organizations without Defender for Office 365: A maximum of 1000 domain and email address entries in total: Allow entries: 500 maximum. com work with Exchange Online. Jun 3, 2025 · If you have a hybrid environment, with mailboxes hosted both in Exchange Online and on-premises Exchange, and you have subdomains of the accepted domains that only exist in your on-premises environment, you can enable email flow to and from these on-premises subdomains. . Apr 2, 2019 · Enable mail flow for subdomains in Exchange Online Admins can learn how to enable mail flow for subdomains in Exchange Online. To understand how threat protection works in Microsoft Defender for Office 365, see Step-by-step threat protection in Microsoft Defender for Office 365. You can configure anti-spam policies in the Microsoft Defender portal or in Exchange Online PowerShell. com → directs to the M365 login for that domain. com, and you enable match subdomains, users can send email to, or Minimum DNS records for Exchange Online on a subdomain These are the most common records needed to make @sub. contoso. The values presented in this article are for illustration only. Any ideas? Jan 31, 2026 · Important Use the Defender portal or Exchange Online PowerShell to view the required CNAME values for DKIM signing of outbound messages using a custom domain. Apr 22, 2025 · Admins can learn how to view and modify accepted domains in Exchange Online. Block entries: 500 maximum. Jul 2, 2025 · For more information, see Configure threat policies. Access and manage your Office 365 account, users, and settings from the admin portal. We are running Exchange hybrid, nearly all of our mailboxes are in Exchange Online. Use the exact values shown in your Microsoft 365 admin center domain setup wizard (examples below show the typical pattern).
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