also: ふっけい
noun
Dear Sir or Madam, in reply to your letter ...
Formal salutation used at the beginning of a reply letter, corresponding to 'Dear Sir or Madam, in reply to your letter ...' in English. Used in traditional Japanese correspondence.
拝啓、春暖の候、貴社ますますご清栄のこととお喜び申し上げます。復啓、先日はご丁寧なお手紙をいただき、誠にありがとうございました。
Dear Sir, I hope your company is thriving in this spring weather. In reply to your kind letter the other day, thank you very much.
Standard kanji form for this formal letter salutation.
Alternate reading; ふくけい is more common.
From 復 (ふく, 'reply') + 啓 (けい, 'to open, to state'). A set phrase in traditional letter writing.