Solutions seem to depend on whether you have two or more mail addresses in 
a ':emails' section or not.
If you have, you should identify the mail address of which you want to 
increment the value.
Anyway, try below:

(dosync
  (alter result
    (fn [v]
      (mapv second
        (update-in (into {} (map #(vector (:id %) %) v))
          [1 :emails "a...@mail.com"]
          inc)))))

HTH,
with regards,
Yoshinori Kohyama

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