Forum Discussion
Exchange Hybrid sending external email from on-premises
I have an Exchange 2019 server setup as our hybrid server. Mail flow works fine to any mailboxes moved to Exchange Online, inbound from the Internet is delivered successfully to on-premises mailboxes...
Hope you have created the connector with the below command. You may need to use the Get-SendConnector command and verify the below settings, and Set-SendConnector command to set it accordingly. Also, make sure Outbound Port 25 is Open from Exchange Servers to Microsoft IP's
New-SendConnector -Name "Outbound to Internet via Office 365" -AddressSpaces * -CloudServicesMailEnabled $true -Fqdn mail.xyz.com -RequireTLS $true -DNSRoutingEnabled $false -SmartHosts xyz-com.mail.protection.outlook.com -TLSAuthLevel CertificateValidation