Once a week, 17-year-old Unique Higgins of Dorchester walks around the block to the Grove Hall Post Office on Warren Street, clutching a letter to her boyfriend of three years.
She buys a stamped envelope and mails the handwritten note to the Suffolk County House of Correction, where her boyfriend has been in jail for more than a year.
“It’s convenient, and this way, I know it will get there overnight,’’ Higgins said as she slipped the letter into the slot on the post office’s inside wall yesterday. “If this place weren’t here, I’d have to take the bus.’’
Higgins has good reason to worry about the future of the neighborhood fixture. It is among 43 post offices across the state - including five in both Boston and Newton - that the struggling US Postal Service is studying for possible closure as it confronts falling revenues and a declining number of walk-in customers amid the migration of snail mail to the Internet.

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