It is my pleasure to write here for you.
Further to our conversation earlier, .........
As discussed over the phone, .......
Thanks for you kind reply.
Thank you for your inquiry/email.
Thanks for your letter. It is my pleasure to receive your reply!
Thanks for your mail of 日期............
We will noted and many thanks!
I hope everything with you is fine.
Many thanks for your support.
I hope you are well and in good health!
FYI: for your information
(1) We hope to receive your favors at early date.
(2) We hope to be favored with a reply with the least delay.
(3) We await good news with patience.
(4) We hope to receive a favorable reply per return mail.
(5) We await the favor of your early (prompt) reply.
(6) A prompt reply would greatly oblige us.
(7) We trust you will favor us with an early (prompt) reply.
(8) We trust that you will reply us immediately.
(9) We should be obliged by your early (prompt) reply.
(10) Will you please reply without delay what your wishes are in this matter?
(11) Will you kindly inform us immediately what you wish us to do?
(12) We request you to inform us of your decision by return of post.
(13) We are waiting (anxious to receive) your early reply.
(14) We should appreciate an early reply.
(15) We thank you for the courtesy to your early attention.
(16) We hope to receive your reply with the least possible delay.
(17) Kindly reply at your earliest convenience.
(18) Please send your reply by the earliest delivery.
(19) Please send your reply by messenger.
(20) Please reply immediately.
(21) Please favor us with your reply as early as possible.
(22) Please write to us by tonight's mail, without fail.
(23) May we remind you that we are awaiting your early reply?
(24) May we request the favor of your early reply?
(25) A prompt reply would help us greatly.
(26) A prompt reply will greatly oblige us.
(27) Your prompt reply would be greatly appreciated.
(28) Your prompt attention to this matter would be greatly esteemed.
(29) We look forward to receiving your early reply.
(30) As the matter is urgent, an early reply will reply.
(31) We reply on receiving your reply by return of post.
(32) We request you to accept our warmest thanks for the anticipated favor.
(33) We thank you in advance for the anticipated favor.