As an iPaaS customer, you can do the trading partner onboarding via the X.400 mailbox. In this case, you need to book the X.400 mailbox, i.e. at the Telekom Deutschland GmbH.
The provided login credentials can be configured either by you or with support of a SEEBURGER consultant on your iPaaS system to set up the connection from your iPaaS BIS to your trading partners directly via the mailbox.