Now you have to explain this to me:
What do you mean by “only with Swisscom email”?!?
Either you use an email program such as Outlook or Thunderbird or Windows Mail or Apple Mail…
or
You use Swisscom/Bluewin webmail in a browser using http://webmail.bluewin.ch
….keep on rockin' 🤘🏼🤘🏼🤘🏼