Can I answer as alias

[mrmarkuz (Markus Neuberger)]

I think you’re searching for mail identities/profiles:

Configure multiple virtual e-mail domains

Hello! Identities may help you. You have them in Roundcube webmail and in other mail clients like Thunderbird, see https://support.mozilla.org/en-US/kb/using-identities

I guess in sogo you may use the IMAP accounts:

https://sogo.nu/bugs/view.php?id=3551