What is the size limit of attachment?
As for now, the size limit of attachment is 10M bytes. Big attachments have significant influence on mail-server’s performance; the delivery time is unpredictable and any contingent error along the path of delivery (which is more likely than short messages) will result in a failure. Like emails in general, sending an attachment should not be considered as confidential, because the mail traffics are not encrypted. Generally speaking, attachment should not be used as a way of distributing big files.
