Attachments received at an email account are processed according to a processing rule that is selected using, for example, a sender's email address, the sender's domain, or metadata in the email. A feature triggers the processing rule that then removes the attachment from the received email and stores the attachment in a rule-indicated directory. Processing rules can be defined by the email sender or by the email recipient. Changes to the attachment can be synchronized across multiple user devices and user accounts using a file sharing application.