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How to configure MailEnable mail relaying on Google Cloud Platform or Azure?
According to official Google Cloud Platform Documentation Google Compute Engine does not allow outbound connections on ports 25, 465, and 587.
According to official Azure Update Azure does not allow outbound connections on port 25.
In order to setup mail relaying, follow these steps:
Note: These services may have a free tier for some of the platform's users. For additional information, refer to the documentation of the service.
Connect to the server using RDP
Open the MailEnable Administrator in Start > Mail Enable
Go to Servers > localhost > Services and Connectors > right-click on SMTP > Properties > Smart Host
Select Smart Host Enabled and under IP/Domain type:
In the Port field type 587 for Azure or 2525 for Google Cloud Platform
Select The remote server requires authentication, enter the credentials provided after the registration on the mail relay service and click Apply
Note: For more information on how to properly setup the relay authentication and proper credentials, refer to the documentation of service.
Restart SMTP Connector: right-click on SMTP > Stop and then click on Start