Currently the duration at which the mail is checked appears to be defaulted to 1 minute. In certain use cases this can cause mail servers to rate limit or block connections. Please provide the ability to set that polling period.

For example, Office365, using IMAP will limit maximum concurrent connections to 20, causing any Jira instance with more than 20 mail handlers (in any combination of Jira Core & Jira Service Desk) will start getting connection refused (as of 27/030/2019).

Workarounds

There are two ways to work around this:

1. Firstly you could work with the mail server to white-list connections from the JIRA server so that they are not rate limited.
2. Unsupported: It's possible to edit the interval by manually editing the database (Versions < 2.3 only)
   1. Stop JIRA
   2. Edit the entry in the serviceconfig table which corresponds to your service desk's mail handler
   3. An example query to set 10 seconds delay on the entry with id 10200 (ensure you find the correct ID to use yourself, and calculate the delaytime you want):

      update serviceconfig set delaytime = 600000 where id = 10200;
      

   4. Start JIRA
3. Verify the options available for your email service and see if there is any offer that allows more concurrent connections (like POP3 for Office365).