Monthly Archives: June 2026

Immutable SMTP aliases in Exchange Online

In researching why we couldn’t remove a *@[PRIMARY TENANT DOMAIN].onmicrosoft.com SMTP alias as part of an account re-name clean-up we discovered and confirmed with MSFT support that upon creation of a mail object in Exchange online, a permanent address of  <alias>@<primary_tenant_domain>.onmicrosoft.com is given … Continue reading

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