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DusanGligoric's avatar
DusanGligoric
Copper Contributor
Apr 27, 2023

Microsoft Teams email server

Hello,   I'm having an issue that I'll try to explain in few steps: 1. Our company has O365 Business Standard licenses. 2. We are using our own locally hosted mail server. 3. By default, when cr...
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StevenC365's avatar
StevenC365
MVP
Apr 28, 2023

DusanGligoric my guess from your description is that you have both on premises mailboxes and mailboxes in Exchange online associated with your Teams accounts, the 'unable to reply' is because it's not coming from the mailbox your users are using.

 

Assuming your local server is Exchange, you need to configure it so that Teams can access it over the internet, it's relatively complex to do but instructions are here How Exchange and Microsoft Teams interact - Microsoft Teams | Microsoft Learn.

 

In general it's simpler to set up Exchange Hybrid between local server and Exchange Online, which is also the first step towards migrating email. Teams doesn't need you to migrate, but it really should be your longer term roadmap. Create a hybrid deployment with the Hybrid Configuration wizard | Microsoft Learn

 

If your local server isn't Exchange Online then you are simply out of luck.

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