Addresses should be formatted in the subject line as you see below, taking care to use semicolons and not commas. Each semicolon represents an address line. There may be 3 - 5 address lines.
Name; Organization (optional); Street Address (or PO Box); City State Zip code; Country (If international)
Carly Brown; Click2Mail; 4520 Plank Rd Suite 102; Fredericksburg VA 22407
Carly Brown; 3103 10th S N Suite 201; Arlington VA 22201
Carly Brown; 71 Cherry Court; SOUTHAMPTON SO53 5PD; United Kingdom