I setup jira to create issues whenever an email arrives.
Now I was wondering if there is a possibility for jira to scan the mail for a keyword and add the value after that keyword into a custom field.
Any idea how that might work?
Not with the built-in "mail handlers". They read some of the message, but don't try to do anything clever. Subject, priority, body and some user stuff is parsed out.
As there's so many things you might want to do with incoming email, it's impossible to code a generic case and hard to code one which is flexible. Atlassian have left it to 3rd parties to do that sort of thing.
Your options are to write your own handler, or have a look in the marketplace to find one that can do what you want. As usual, I'll mention JEMH, as Andy has done all that hard work to make a truly flexible mail handler (and more)
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