Mail alias in roundcube

Hi, I tried many times to add aliases in roundcube, for domains i don’t own (open email, to manage the contact adress with many other members of a group. Another one is my university address, which is redirected to my own, but i can’t answer with the formal adress when i need it.

Roundcube will add the alias, but it will be cleaned next time i open it.

i tried

yunohost user update v --add-mailalias "contact@domainidontown.tld"

and i get an error because the domain is not handled by me

Is there a way to manage aliases so they don’t get erased ?

Thanks !