Audriga
"Please have a look at our notes for self-configured servers before starting a migration." Link goes to https://www.migrate-mail.com/en/handbook/configure-provider-or-server.html there it says "Adding a self-administrated server"
Add provider or server ssl0.ovh.net with 993 - one gets a animated waiting graphic and one can only Cancel that menu since Save does not work, nor changing the number. The Check button remain grayed/inactive.
ssl0.ovh.net with 7 - one gets an error and can type another port.