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In VPOP3 Enterprise (not VPOP3 Basic) you can create multiple SMTP services. This can be useful if you want VPOP3 to listen on different ports and/or have different settings.
There are two ways of doing this.
This can be useful if you want a single SMTP service configuration to listen on multiple ports, eg ports 25 and 587 or ports 25 and 2525, etc or multiple IP addresses (if your PC is configured with them). The SMTP services will have identical configurations.
To do this, go to Services in the VPOP3 settings and select the appropriate SMTP service from the list at the left.
Press the Edit Bindings button
Now, in the Edit Service Bindings window, press the New button to create a new binding and double-click the Address and Port cells to edit those as desired.
Press the Submit button to save the changes.
Note that only one thing can listen on an address/port combination, so you cannot have two VPOP3 services listening on the same combination, or VPOP3 listening on the same combination as other software on the same PC.
This is useful if you want to have a different configuration, eg different authentication requirements, different access restrictions or different encryption requirements.
To do this, go to Services in the VPOP3 settings and select General from the list at the left.
At the bottom of the page, press the Add SMTP Server button.
This will create a new SMTP service called New SMTP Server in the list at the left of the screen. This will be configured to listen on port 5025 (or the first spare port after that). You can click on that service to edit it as you wish.
Some standard ports & configurations are: