HR and Finance occasionally need to email more than 1,500 employees across several Exchange Online tenants, but we're running into sending limits. Would High Volume Email work across tenants, and how would staff send through it? Would Azure Communication Services require development?
How can HR email all employees across multiple Exchange Online tenants?
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_loosely!sideways_8
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I'd start by checking whether a restricted all-employee distribution group in each tenant fits the setup. HR could send to the group addresses from Outlook, and each tenant would expand its own group locally. Restrict who can send to the groups, and consider moderation.
Test it with the actual cross-tenant arrangement before relying on it. You may need mail contacts or other directory configuration to make the groups available across tenants, and it's worth confirming which limit the current messages are hitting.
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High Volume Email isn't a good fit if the same message needs to reach people in other Exchange Online tenants. Those recipients are external to the sending tenant, and external addresses aren't supported by the service.
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Azure Communication Services is an option for bulk mail across tenants, but it isn't a normal Outlook sending experience. Plan on an application or SMTP workflow rather than handing HR a mailbox and expecting them to compose a message as usual.
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For occasional announcements, a newsletter or email campaign service may be easier for HR and Finance to use than building an application around a bulk mail service. Compare that option with the distribution group approach, especially if the people sending messages need their own composing interface.
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3b!teapotwrench_820:
If a distribution group has already been tried, check whether the message was addressed to the group itself or to a large list of individual recipients.