Gmail is no doubt one of the best email services out there, however, it does have an annoying feature which keeps adding email addresses as contacts when you email someone new. This can be quite a pain because your contact list will start growing with unnecessary contacts.
Google has been listening to feedback and has introduced a new feature where users can disable Gmail from adding new users you email to your contacts list.
To enable this feature, head over to the Gmail settings page and look for the option which says “Create contacts for auto-complete”. Now select the option which says “I’ll add contacts myself” and save the settings. Once you have enabled this feature Gmail will not add new contacts to your contacts list unless you do it manually.