Tag: Proxy addresses

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Finding Unused Proxy Addresses for Exchange Online Mail-Enabled Objects

Finding Unused Proxy Addresses for Exchange Online Mail-Enabled Objects

A request came in about how to find unused proxy addresses for Exchange Online mail-enabled objects. There's no out-of-the-box report available for proxy address usage, but we can solve the problem by using a PowerShell script to download historical message trace data to check every proxy address for all mailboxes against. The question then is what to do with the unused proxy addresses?

November 5, 2025
Exchange Online to Enable Plus Addressing Everywhere in January 2022 14 Comments

Exchange Online to Enable Plus Addressing Everywhere in January 2022

Microsoft has announced their intention to enable plus addressing across Exchange Online in January 2022. Plus addressing is a good capability, but it might cause some problems for tenants with mail-enabled recipients that have plus addresses in their set of proxy email addresses. Fortunately, we've written some PowerShell code to report those pesky addresses and to remove them if you want to do a big clean up before Microsoft makes the big switch in five months' time.

August 16, 2021