@Stiofeugrie35
The Bluewin mail service is really only built for @bluewin.ch and @bluemail.ch mail and not for "foreign" domains.
If you want to send from [info@'mydomain'.com](mailto:info@'mydomain'.com) you better are also able to receive mail at that address. That in turn means there needs to be a mailserver handling that domain and you should usually be able to use that to send your messages as well.
On the other hand if there currently is no mail infrastructure what-so-ever maybe the Mail Hosting S Website & Hosting: The right products for your SME Package might be an option for you.
@DomiP Musste auch nachfragen und ich war abwesend
Gruss
Chris