I want to create ticket in jira via email and limit that to only company domain so that no one from outside shall spam it.
Is it possible to limit jira from accepting email from specific email or domain
Filtering email is far more efficient if done by your mail server - most support simple black/whitelists - if you're on a decent mailserver, frankly, it's one line to say "only accept mail from domains X, Y or Z". Rather than have to process it there, then pass it to Jira and have to write something for Jira to do the filtering.
That's not quite clear.
Exchange is not going to send the email anywhere. Jira picks up incoming email from a mailbox that Exchange provides for it to read. What you want to do is tell exchange to dump any email that doesn't match your domain before it puts it into the mailbox for Jira to pick up.
You'll need to read the documentation for the mail server you are using. I'd look for the word "whitelist" in it - a whitelist means "only accept mail from people on this list" (And usually can be set up with rules like "must be from domain X")
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