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Cliff Clavin's concern, 5 letters
Drops in a post office slot, 5 letters
Drops in the letter box, 5 letters
Exercises the franking privilege, 5 letters
Puts in the letter box, 5 letters
Puts into the postbox, 5 letters
Sends a fan letter, maybe, 5 letters
Sends in a stamped envelope, 5 letters
Sends out a query letter, 5 letters
Sends via the postal service, 5 letters
Uses the post office, 5 letters
Where holiday delays are common, with the, 5 letters
Loot in an old train robbery, 9 letters
Submits a 1040, perhaps, 7 letters
Submits, as a rebate form, 7 letters
Doesn't give one's best effort, 9 letters
Performs halfheartedly, slangily, 9 letters
Performs lackadaisically, slangily, 9 letters
Opening for letters, 8 letters
Place to drop a letter, 8 letters
Narrow openings in some doors, 9 letters
A sorter for sorting mail according to the address, 10 letters