Recipient and sender limits for Microsoft Office 365 Dedicated/ITAR (vNext) customers are set by default.
vNext users are limited to sending an email message to no more than 5,000 recipients per email. However, they can send an unlimited number of messages per day. For more information about recipient and sender limits, see Recipient and sender limits.
Article ID: 3146166 - Last Review: Mar 4, 2016 - Revision: 1