通信存款是指华侨、港澳台胞、外籍华人及批准出境定居或留学的国内居民，将其在国外的资金委托国内银行办理储蓄存款的一种方式。
A client sending a letter authorizing the bank to handle the deposits by correspondence may go through the account opening procedures by attaching duplicates of his or her ID card, passport or exit pass and other valid credentials, filling out the Application Form for Opening Account of Deposits by Correspondence, choosing the type of deposits according to the types of services already transacted by the bank (say, current deposit, time deposit and current-time optional deposits, etc.), and also pre-assign the method of withdrawal later.
来信委托银行办理通信存款开户的客户，须附身份证、护照或出境通行证等有效证件的影印件，填写“通信存款开户申请书”，根据银行已开办的业务种类（如活期、定期、定活两便等）选择存款种类，并约定日后的支取方式，即可办理开户手续。
