Like practically all email services, iCloud Mail does limit the number of recipients you can add to a single email message; in addition, it will not let you send an infinite number of emails with but few people in the To:, Cc: and Bcc: fields either and limits the total number of recipients (across all the emails you send) per day as well.
iCloud Mail Recipient Limits per Message and Day
iCloud Mail allows you to address emails to
- up to 100 recipients per message and
- up to 1,000 recipients per day across
- up to 200 messages per day.
You can send 10 emails to 100 people each in a day, for example, or 198 messages with, on average, 5 recipients (and five ninety-ninths).
(Updated August 2012)