Getting custom field value in an email and assign it to new ticket through mail handler?

Yeoh Tun Liang

I'm trying to create a custom mail handler that works like mail handler provided by JIRA but with extra features which allow mail handler to capture the custom field value in the email and automatically assign these values to the corresponding custom field.

Is it possible to do so by creating a new plugin or I have to do it through script? 

Nic Brough -Adaptavist-

Mail handlers are mostly implemented as add-ons, and that is the easiest way to do it.  Scripting depends on what scripting add-ons you have installed.

There's a few resources I'd point you at, but as you say you want to create a handler, I suspect a walkthrough of coding one as an add-on is the best start - https://developer.atlassian.com/jiradev/jira-platform/guides/email/tutorial-custom-message-mail-handler-for-jira