Hello,
in our installation, the UTM is configured as Host-based relay for our Exchange Server, which is the only allowed host for relaying. Now it's required to allow an dedicated external system to send mails from our smtp-domain, so I want to allow the external system to use the UTM to send mails.
I have to add the IP-address of the external system to allow relaying, are there any other options to make this more secure? I want to allow the external system to use the mail server with one dedicated sender address, is it possible to limit it?
Kind regards & thanks in advance
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