Yes, it is possible to send messages for several domains via one IP address. Here you have 2 possibilities to set up in EuropeanMX:
Log into the Admin Panel at the domain you want to use as the main domain and under which the messages of all domains will be collected later. To learn how to log into the Admin Panel, see our FAQ article "How can I log in to the Admin-Panel (web interface of the filter)?".
Go to the section Outgoing, click on Manage Users, enter the IP address under Authenticating IP or Range and click on Add and Configure. Set the limits according to the settings of your mail server (please see our FAQ article "How do I set up an outgoing user?" for more information about the configuration of the outgoing filter). Save the settings to complete the setup.
All sent messages that are forwarded from this IP to our filter servers are now displayed in the log search of the domain where you created the IP address as outgoing user.
Log into the Admin Panel at the domain you want to use as the main domain and under which the messages of all domains will be collected later. To learn how to log into the Admin Panel, see our FAQ article "How can I log in to the Admin-Panel (web interface of the filter)?".
All messages that are now forwarded to our filter servers via the configured IP should now be displayed under the respective domain in the log search.