Message size and recipient limits within O365


Question

What are my Recipient limits

 

Answer

Recipient limits

Maximum size of a message that can be sent to the specific recipient (INTERNAL) 100MB
Maximum size for a message sent by Outlook on the web 35MB
Maximum number of recipients in a message 500 recipients per message.  (Distribution Lists acts as one recipient)
Maximum size of a message that can be sent EXTERNALLY

25MB

Maximum Sending Limit

5000 recipients per 24 hours

Maximum Daily *non-relationship messages per day

1000 recipients per 24 hours

*A “non-relationship recipient” is someone you've never sent email to before.