From: author@example.com
To: commits@list.com
Subject: [cbas] topic2 branch created. $existing_commit_hash
X-Git-Refname: refs/heads/topic2
X-Git-Reftype: branch
X-Git-Oldrev: 0000000000000000000000000000000000000000
X-Git-Newrev: $existing_commit_hash

The branch, topic2 has been created
        at $existing_commit_abbrev create branch on topic 2

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