LetterAgent
Mail physical letters by just asking your AI assistant.
Yes. A fax leaves several trails: the header line carries the sender's number, the phone company records the call, and an online fax service logs the sending account. There is no truly anonymous way to send a fax.
| Trail | What it shows | Who can see it |
|---|---|---|
| Header line | The sender's number and name, printed on every page | The recipient, right on the page |
| Caller ID | The number that placed the call | The receiving machine's display and logs |
| Phone records | Calling number, receiving number, time, duration | The phone companies on both ends |
| Online fax service logs | The account, upload IP, and document sent | The service provider |
| Receiving machine memory | Recent incoming numbers and page counts | Whoever controls the receiving machine |
Any one of these usually identifies the sender on its own. Together they make fax one of the least anonymous ways to send a document: more traceable than a letter dropped in a mailbox, and far more traceable than most people assume.
Some services advertise faxing without signing up or showing your number, but anonymity is an illusion. The service still logs the session: the IP address the document came from, the time, and the destination number. If a fax becomes a legal matter, those logs can be subpoenaed like any other business record. And on the receiving end, the fax still arrives from the service's own gateway number, which identifies the service even when it hides you. Treat "anonymous fax" marketing the way you would treat a disposable email address: convenient for casual use, not actually untraceable.
Most often with misdirected faxes. Sending a fax to the wrong number is one of the top causes of privacy breaches in healthcare and legal offices: a document full of personal information lands on a stranger's machine, and the header line is how the recipient figures out who sent it and calls to report the mistake. Tracing also matters for harassment and junk faxes, where the recipient's phone records and the sender's service logs are how investigators identify the source. And in disputes, a fax's confirmation page plus the phone record is exactly the kind of evidence that shows a document was sent, when, and to which number.
It muddies the header line and the caller ID, but not the deeper records. A spoofed fax still traveled through phone networks and, usually, an online service, and those systems logged the real origin even when the displayed number was fake. Spoofing makes casual identification harder; it does not make a fax invisible to investigators who can pull the carriers' own records.
LetterAgent's fax feature is currently in testing, so faxes are quoted and handled with care while activation completes. Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
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.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com