Use a desktop application for easily log your daily work, even if your are offline. When you are ready just push a button to send all entries to your JIRA server instance. I'ts the best replacement for notebooks: you will save a lot of time!
Email Helpdesk is a friendly tool to effectively use JIRA as an email-based help desk system. Configure a multi-level support service for each of your products in a few steps and you will start receiving new issues (tickets) as emails are received.