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The Office 365 server has the maximum send and receive message size (and optional attachment) set at 25 MB. Keep in mind that someone's mailbox on the Office 365 server will be prohibited from receiving messages if they exceed the maximum quota limit.
They can achieve it by: 1  using email send limits: per day, per hour or per number of recipients; 2  blocking the SMTP mail server port (25), so you can't use a 3rd party SMTP agent to send our your emails; 3  using whitelists, so only certain customers can send out mass emails (usually by having customers to purchase an upgrade package).