Office 365 Enterprise (E1, E2, E3, E4, K1, and K2), Professionals and Small Businesses (P1), and Government plans (G1, G2, G3, and G4) to allow users to send email to up to 10,000 recipients per day. These new limits also apply to standalone Exchange Online plans (Kiosk, Plan 1, and Plan 2). Previously, the recipient rate limit for users of these plans had been set at a maximum of 1,500 recipients per day.
The best way to avoid exceeding the recipient rate limit is to use distribution groups when sending messages to large numbers of recipients. Distribution groups stored in the shared address book are counted as a single recipient toward the recipient rate limit. Directions for setting up distribution list is linked here!
If you would like more information on recipient rate limits, contact us!