Dear community, 25 years ago i was using a macbook. The mail app had this feature: I could use whatever keyword from the contacts in my address book (f.e. people in the same company, or the same region, or everyone that i had added a word like "friend", "business", "sailing" etc) to create a "smart group". I find this very convenient and since then i always add some keywords to my contacts. I migrated to Linux some years ago and i am missing this feature again and again. Is there any way to configure a mailing list according to contact-content instead of doing it manually? If not, is there any email client that could do that?

Thanks!