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email friend; email penpal
メル友ができて嬉しいな。
I'm happy I made an email friend!
昔のメル友と何年かぶりに再会した。
I reconnected with an old email friend after several years.
彼女は全国にたくさんのメル友がいるらしい。
It seems she has many email friends all over the country.