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Lawyers keep faxing for the same reasons banks do: courts still accept faxed filings in many places, the confirmation page is a timestamped record that the transmission went through, and plenty of counterparties still work from paper files. When the firm across the table runs on paper, the fastest route to them is the channel they already use.
Many do, for at least some kinds of filings. Electronic filing has taken over most routine court submissions, but fax filing never fully disappeared: some courts still accept faxed documents, and dedicated fax-filing services exist to route documents into court systems. For a lawyer up against a filing deadline, a fax that produces a timestamped confirmation page is a known quantity, and known quantities win when the clock is running.
There is also the counterpart problem. A lawyer does not choose the other side's technology. If opposing counsel's office still keeps paper files, sending a fax puts the document straight onto their desk instead of into an inbox nobody monitors. Fax survives in law the way it survives in medicine and banking: the network is other people.
The confirmation page prints the date, time, destination number, page count, and result of the transmission. Lawyers file it as proof the fax was sent: if a dispute later arises about whether a document went out on time, the confirmation page is the exhibit.
Here is the honest limitation, and it is one non-lawyers miss: the confirmation page proves a machine at the other end received the pages. It does not prove a human read them. A fax can transmit perfectly to a machine in an empty office and sit in the tray for a week. For proof that a person actually got the document, lawyers pair fax with a follow-up call, or use certified mail, which records delivery to an address. The table below lays out the trade-offs.
| Channel | Arrives immediately | Paper trail | Proof a person received it |
|---|---|---|---|
| Fax | Yes | Confirmation page with timestamp and page count | No: proves machine receipt only |
| Yes | Sent folder and headers | No, unless the recipient confirms | |
| Certified or registered mail | No: takes days | Tracking plus proof of delivery | Closest: records delivery to the address |
That combination, immediate arrival plus a paper trail, is why fax hangs on in practices where timing matters. And for lawyers who would rather not own the hardware, LetterAgent sends outbound faxes through an AI assistant: describe the fax and the destination, approve the exact quoted total, pay once through Stripe. US and Canadian fax numbers only, currently in testing, no inbound faxes.
Not even close. Doctors' offices fax prescriptions and referrals, banks fax verification documents, real estate agents fax contracts, and government agencies of all sizes still list fax numbers on their contact pages. The pattern is the same in every case: the institution did not choose fax because it is good, it kept fax because its counterparties still use it.
That network effect is self-reinforcing. A law firm keeps its fax machine because the courts and the firms it deals with have fax machines; those firms keep theirs for the same reason. Any single office that unplugs its machine first just makes life harder for itself, so nobody moves first. Email had to become universal before it could replace fax, and in these corners of professional life, it still has not finished the job.
The honest version of the story is less about technology and more about coordination. Fax is not surviving because it beats email on the merits. It is surviving because replacing it requires thousands of independent organizations to change at the same time, and nobody is in charge of making that happen.
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.
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