此致

cǐzhì
(used at the end of a letter to introduce a polite salutation)

CEDICT

Entry Composition

1 此 cǐ this; these
=2 致 zhì (bound form) fine; delicate; exquisite
=2 致 zhì
  1. (literary) to send; to transmit; to convey
  2. (bound form) to cause; to lead to; consequently