To use mail handlers and process your incoming emails to create or modify issues, first the incoming Mail Accounts should be configured. Due to security reasons, the Email This Issue addon can not access the mail servers in Jira itself, so mail accounts should be configured within Email This Issue's Administration interface
Click on the Add button to create a new Mail Account
Both IMAP and POP3 can be used. Currently Email This Issue does not delete processed emails and only the Inbox folder can be processed. Before saving the Mail Account, please use the "Test Connection" button to check if Email This Issue is able to connect to your mailbox.
After creating Mail Accounts, go to Mail Handlers to configure the actions that should be executed when processing new emails