Mailman, Bring Me No More Blues

The speaker has received a painful letter from someone who says the relationship is over. He asks the mailman not to bring any more letters, because even one has caused him deep sadness. The feeling moves from shock and grief toward an attempt to avoid more hurt, though the speaker still sounds overwhelmed.

The “blue letter” links the physical letter with sadness; “blue” can suggest feeling unhappy. Saying “one little letter is all I can use” is not really about the letter’s practical usefulness: it suggests that one message is already more than he can bear. His request for the mailman to stay away from his door turns an ordinary delivery into a reminder of possible pain.

The speaker says he cried so much that he could cry no more, which may be an emotional exaggeration rather than a literal description. His repeated plea sounds both firm and helpless: he wants to protect himself, but cannot undo what the letter has told him. It is unclear whether he fears more letters from the same person or simply wants distance from any reminder of the breakup.