Office Chat does not allow .exe and some other file types (files are blocked by default). In addition, we ensure that email is from a user who is a Group member, has permission to post to the group and reply-to address hasn’t expired. Outside of these, Office Chat doesn’t do any virus check on email attachments.

Maximum size of email replies is 20MB. i.e. if the total size of the email including attachments exceeds 20MB, our email server will reject the received email.