LetterAgent
Mail physical letters by just asking your AI assistant.
"c/o" on an envelope means "care of": the letter is for the person named on the first line, but it should be routed through the person or business named on the c/o line. It goes between the recipient's name and the street address, and you use it when the recipient doesn't have an address of their own at that location.
| Line | Example | What it does |
|---|---|---|
| Recipient name | Jordan Ellis | The person the letter is actually for |
| c/o line | c/o Northwind Supply Co. | Who should receive and pass along the letter |
| Street address | 400 Harbor Ave, Suite 200 | Where the postal service delivers it |
| City, state/province, ZIP/postal code | Seattle, WA 98101 | Routes it to the right post office |
Use it whenever the recipient receives mail somewhere that isn't their own address. The classic cases: someone staying with a friend or relative for a while, an employee receiving personal mail at their workplace, a tenant whose landlord handles the building's mail, or a contractor working out of a client's office. In each case, the person at the address isn't the recipient, so the c/o line tells them "this is yours to pass along."
Don't use c/o when you know the recipient's own address: it adds a middleman for no reason and slows things down. And don't use it as a privacy trick: the c/o name has to be a real person or business at that address, or the letter may bounce. The postal service delivers to the address; it's the named intermediary who gets it into the right hands.
The order is fixed: recipient's name first, then the c/o line, then the street address, then the city line. Like this:
Jordan Ellis
c/o Northwind Supply Co.
400 Harbor Ave, Suite 200
Seattle, WA 98101
Keep the c/o line short and exact: the company or person's name as they'd recognize it. Don't bury instructions in it ("c/o Northwind, ask for Dave in receiving") because the carrier never sees this level of detail; the c/o line is for the recipient at the other end. One more detail: the c/o name should match how mail is labeled at that address. If the office's mailroom files everything under the company name, use the company. If the host is a person whose name is on the mailbox, use their name.
One last distinction: don't confuse c/o with "ATTN" (attention). ATTN routes a letter to a specific person or department inside a company that is itself the recipient, like "ATTN: Accounts Payable" at a business address. c/o is for when the recipient is a guest at someone else's address. Use ATTN for departments, c/o for people borrowing an address.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it's printed and mailed.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.