The TechNet article describing the Maximum Message Size Limit under Transport rules has this to say as a definition for Message size limits:
Message size limits These limits apply to the total size of a message, which includes the message header, the message body, and any attachments....
we are trying to figure out if the maximum size applies to the email in spite of the number of recipients.
My Maximum Size Limit is 15360
I am sending out an email with a 10MB attachment,
If I send to one recipient, the email will be sent no problem, as it is under the size limit
If I send the same email to 5 recipients, will this email appear to be above the limit at 50 MB 5 recipients x 10MB attachment) and be blocked?