Exchange Trusted sender

Copper Contributor

Hi everyone,

so our organization is using a third party software that has its own SMTP built in.

however, that software lets us enter a from email, so we entered : 

however, when that software sends emails, to our organization's users, the picture from that email is hidden and the user has to manually download it in outlook, and we would like the picture automatically downloaded.


here are the option I tried so far. 

1: allowed the public IP of the external SMTP.

2: used the PowerShell cmdlet: Set-MailboxJunkEmailConfiguration "user name" -TrustedSendersAndDomains @{Add=""} 

This does not work since Microsoft does not allow trust sender our own domain.


but when I manually enter the

in the outlook safe senders, the picture is automatically downloaded, but this solution is not convenience because I need everyone to have it.

GPO is not an option for us. 


3: Set the spam confidence level (SCL) to '-1' in exchange 


The only thing I found so far, is to  Import-ContactList  of the email to all users, since by default Microsoft trusts contacts.


if anyone has a better suggestion, I would gladly take it : we use exchange online


Thank you !




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