A formal greeting used at the beginning of a letter to express one's happiness for the recipient's good health. It is typically used following a seasonal greeting, as in 'I am delighted to hear that you are in ever better health in this current season.'

相手が健康で元気に過ごしていることを喜ぶ、改まった手紙の冒頭で使う挨拶。「時下ますますご健勝のこととお慶び申し上げます」という形で、時候の挨拶に続けて用いるのが一般的。