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?
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
The tutorial is there to show you how to get the data from the incoming email. What you do with it is another step. All you've said is "capture custom field" - that's fine, but your code needs to call issue.setCustomFieldValue(cf, value) with good data to do that. Ok, you need to work out what cf is in there - it's a customfield object, and I usually use customFieldManager.getCustomFieldByName("my custom field") to fetch that, but there may be better ways. The bit I can't help you with is the value. The example code exposes all the data in the incoming email. What you process that into, I can't tell you.
I tried myself the JIRA Email This Issue Plugin. You are able to define rules for initialisation of fields.
Hope it helps.
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