Partners (suppliers and customers) will not be automatically added to followers list.
New behavior :
-When adding a follower suppliers and followers will be ignored they can be forced by using the "Add external partners as followers" check
-When sending a message the suggested recipients are not check by default anymore
-If checked they will have a contact created and will be sent the message but will not be added as follower
Adding a supplier or customers as a follower has to done via the add follower function explicitly by using the "Add external partners as followers" check