Forum Discussion
Can't send SMTP mail after setting Default Security in Office 365
LusoAdmin Hey there. I'll put the solution here because as far as I can tell, everyone should also have that problem now. It took 1 week with the Microsoft support to finally find the solution. Just like I thought, because now the default security is enabled when you create a new tenant, even if you disable it, smtp somehow stays disabled and that overrides the settings in your admin panel.
All you have to do is enable it in Powershell. To connect with Powershell, first you have to execute this:
Connect-MsolService
Import-Module ExchangeOnlineManagement
Connect-ExchangeOnlineThen you enter your admin credentials. After that, you can check the "smtp disabled" flag, it should be set to "true":
Get-TransportConfig | Format-List SmtpClientAuthenticationDisabled
To enable smtp and get things working again, you enter this command:
Set-TransportConfig -SmtpClientAuthenticationDisabled $false
Worked for all my tenants. I hope this helps you too!
I use Kyocera devices. SMTP used to work, until I activated Default Security.
For new Office 365 tenants, Default Security is now standard set to 'on' , so new Office 365 users won't be able to send SMTP mails with multifunctional devices.
I was hoping there would be a simple way just for one user (or shared mailbox) to send SMTP mail.
MarcVHB Right, you would need use a mailbox that has a username and password unfortunately.
