Important part of collaborative project editing is notifying other team members about new keys. There are several ways to do this, starting with simple Slack integration, however the most popular method is sending a notification e-mail.
Once a team lead or developer adds a new key (or imports several), it is necessary to select these keys in editor and do the mass-action choosing "Notify contributors..." from the floating box.
You will be able to select individuals or add them in groups by language teams. There is an option to type individual e-mail message, while Lokalise will automatically add a link to selected keys to this e-mail.