Forum Discussion

hoyty76's avatar
hoyty76
Iron Contributor
Apr 30, 2019
Solved

Conditional Access for external SMTP authentication

We only have one use for external services sending via Office 365 in an authenticated method. I was hoping to use conditional access to restrict only one account to be able to authenticate into SMTP....
Conditional Access
  • Sauky's avatar
    Sauky
    Apr 12, 2022
    You can disable SMTP AUTH globally for your organization by using Exchange Online PowerShell. And then enable it per mailbox in the Microsoft 365 admin center or using Exchange Online PowerShell.
    https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission
Sauky's avatar
Sauky
Copper Contributor
Apr 12, 2022
You can disable SMTP AUTH globally for your organization by using Exchange Online PowerShell. And then enable it per mailbox in the Microsoft 365 admin center or using Exchange Online PowerShell.
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission

Resources