Rules and Folders
Enable Office 365 Groups to work with mailbox rules, folders and transport rules.
Also make Office 365 Groups able to be used in transport-rules (e.g. If recipient belongs to... O365 Group)
I have set rules to divert mail from certain senders or projects direct into appropriate folders.
Having just berated some of my contractors for not uploading designs on time I find that the notifications (which was rule set to go into and "incoming " folder) has gone into junk.
Microsoft really! you are supposed to improve your products but with Outlook 365 you have ruined a product that used to work well.