Allow user send as alias
https://www.alitajran.com/send-from-alias/
- Open PowerShell
- connect Exchange PowerShell
PS C:\Users\xx> Connect-ExchangeOnline
- check current configuration
PS C:\Users\xx> Get-OrganizationConfig | ft Name, SendFromAliasEnabled
- enable send as alias
PS C:\Users\xx> Set-OrganizationConfig -SendFromAliasEnabled $True
- check current configuration again
PS C:\Users\xx> Get-OrganizationConfig | ft Name, SendFromAliasEnabled