или так: (некое абстрактное мистическое толкование...so to say)
With the "postman" being God, or Fate, the "delivery" meant for Frank was his own death as just retribution for murdering Nick. Frank had missed the first "ring" when he initially got away with that killing. However, the postman rang again, and this time the ring was heard, when Frank was wrongly convicted of having murdered Cora, and then sentenced to die for the crime.Frank contemplates that when a person is expecting to receive a letter, it is of no concern if at first he does not hear the postman ring the doorbell, because the postman will always ring a second time, and that second ring will invariably be heard. After they escaped legal punishment for Nick's murder, but nonetheless with Cora now dead and Frank on his way to the death chamber, he notes that the postman has indeed rung a second time for each of them.






