Fax marketing in 2026: consent, the CRTC and bulk sending

Short answer: sending the same fax to dozens or hundreds of recipients is technically trivial and legally one of the most tightly regulated acts in direct marketing. In Canada, the CRTC's Unsolicited Telecommunications Rules prohibit advertising faxes without express consent (or a strictly defined existing business relationship), require mandatory disclosures on every page and set specific calling hours, with administrative monetary penalties as the backstop. In the European Union, the "privacy and electronic communications" directive puts fax in the same basket as automated calling systems: prior opt-in, transposed somewhat differently in France, Belgium, Germany, Spain, Italy and Portugal. The practical upshot: a free, no-sign-up fax service cannot serve as a mailing platform — it caps the number of transmissions, refuses imported lists and has no way of verifying your proof of consent. For genuine "fax broadcasting", you need a contracted provider, a clean database and a consent register.

About MondialFax. This article is a general legal information guide, not individualised legal advice. MondialFax sends faxes free of charge and without registration to seven destinations (France, Belgium, Germany, Spain, Italy, Portugal, Canada) from a browser, with a daily sending limit and no bulk broadcasting feature. See the frequently asked questions and the supported countries.

Why advertising faxes are treated more harshly than email

An unsolicited email consumes attention. An unsolicited fax consumes paper, toner, phone line capacity and machine time at the recipient's end. It is this cost shifting that explains the severity of regulators on both sides of the Atlantic: historically, "junk fax" was cracked down on before email spam.

Two consequences that are often forgotten:

• The rule is prohibition; consent is the exception. Unlike B2B direct mail, you do not "test" a fax list to see who responds.
• Liability is shared. The advertiser, the agency and sometimes the technical provider can all be targeted. In Canada, the CRTC can pursue the party that causes the fax to be sent as well as the party that sends it.

This does not mean professional faxing is dead: an order reminder to an existing customer, an appointment confirmation, a purchase order to a supplier all remain perfectly lawful. The dividing line is the unrequested commercial purpose.

Canada: the CRTC regime, the most detailed of the countries served

Canada is the served country where faxing remains most alive — healthcare, pharmacies, insurers, professional practices — and, unsurprisingly, the one with the most explicit framework.

The Unsolicited Telecommunications Rules

The Canadian Radio-television and Telecommunications Commission (CRTC) regulates telemarketing and telemarketing faxes through its Unsolicited Telecommunications Rules, adopted in Telecom Decision 2007-48 and amended since. For a fax with a commercial purpose, bear four obligations in mind.

1. Express consent or an exemption. The National Do Not Call List (DNCL) also applies to fax numbers. You must either hold express consent or fall within an exemption: registered charity, newspaper of general circulation, political party, survey without solicitation, or an existing business relationship (purchase, lease, contract or inquiry within the timeframes set out in the Rules). In every case, you must subscribe to the DNCL and scrub your lists.

2. The mandatory disclosures on the fax itself. Every telemarketing fax must state, on the first page, the date and time of transmission, the name of the person or company on whose behalf it is sent, and a fax number and a telephone number allowing the sender to be reached at no cost to request removal. The removal mechanism must actually work in practice — not a saturated voicemail box.

3. Permitted hours. The Rules restrict telemarketing calls and faxes to reasonable hours, based on the recipient's local time. From Europe, that means counting six hours of difference with Quebec and nine with British Columbia: a transmission launched at 9 a.m. in Paris lands at 3 a.m. in Montreal. Time differences are a recurring trap, covered in detail in our guide on sending a fax abroad in 2026.

4. Record keeping. You must be able to prove consent and keep a trace of removal requests. In practice, that means a time-stamped register — source of consent, date, channel, person.

And what about CASL?

Canada's Anti-Spam Legislation (CASL, 2014) covers "commercial electronic messages": emails, text messages, instant messaging. Faxes are explicitly excluded, precisely because the CRTC already dealt with them through the Unsolicited Telecommunications Rules. An important conclusion: consent collected for an email newsletter does not amount to consent to receive faxes. These are two distinct regimes.

For a French or Belgian sender targeting Quebec, the reflex is therefore to check the terminology and the expected channel: Quebec public bodies publish fax numbers for specific procedures, never to receive advertising. Our article on the fax machine in Quebec in 2026 details these legitimate uses.

European Union: fax sits squarely in the "opt-in" box

On the European side, the basis is Article 13 of Directive 2002/58/EC, known as the "privacy and electronic communications" directive, which makes marketing by automated calling systems, by fax and by email subject to prior consent. Fax is not a grey area: it is named explicitly. The GDPR sits on top for lawfulness of processing, information to data subjects and the right to object.

National transpositions diverge on one sensitive point: the status of legal persons.

Two countries deserve a special mention.

Germany is the toughest. Section 7 of the Act Against Unfair Competition (UWG) classifies fax advertising without express consent as an unacceptable nuisance, including between businesses. The Federal Court of Justice (BGH) has confirmed this repeatedly. Worse: the framework allows a competitor or a consumer association to serve a formal warning with reimbursement of legal fees (Abmahnung), without waiting for the regulator to act. The risk is not theoretical — it is financial and fast. The same reasoning applies to public recipients: German authorities and courts still maintain fax numbers, but have switched to beA for lawyers and KIM for healthcare — never to receive marketing.

Italy combines consent and a register. Beyond consent, the Registro Pubblico delle Opposizioni, extended in 2022 to mobile numbers, shapes telephone marketing practice; the Garante's penalties against data subcontracting chains have been heavy in recent years. And since PEC (posta elettronica certificata) is the legally valid channel for formal exchanges, a commercial fax looks doubly out of place there.

Why a free fax service cannot do mailing

The query "free fax mailing" comes up regularly. The answer is structural, not commercial.

• The daily sending limit is the first barrier. A free, no-sign-up service deliberately caps the number of pages and recipients per day and per IP address, otherwise it becomes a spam gateway within hours.
• No list import. There is no "CSV" field, no shared address book, no scheduling. One recipient at a time, entered by hand.
• No way to verify your consents. An operator who let thousands of faxes go out without proof would put itself at risk: in Canada, the intermediary can be targeted; in Europe, it becomes a processor within the meaning of the GDPR, with the corresponding obligations.
• The reputation of interconnection routes. Transit carriers quickly cut off a source that generates complaints: one rogue campaign degrades delivery quality for everyone.

If your real need is legitimate bulk sending — summonses, regulatory reminders, communications to consenting customers — you need a contracted provider: written contract, declared volumes, usable transmission logs, API, GDPR data processing agreement. That is a different business from the occasional free fax. The real cost of such a setup is broken down in our article on how much a fax really costs in 2026.

Building a defensible bulk transmission

Let us assume you have a lawful use case: members of a professional body, partner pharmacies, dealers in a network. Here is the method.

1. Document consent before the technology

For each number: who consented, when, through which form, for what purpose, and how to unsubscribe. A shared spreadsheet will not hold up for long; a small customer database management application or a lightweight CRM makes it possible to time-stamp and keep a history of removals. In every dispute on record, the absence of proof is the point that tips the case.

2. Scrub the list country by country

DNCL subscription for Canada, checking the Robinson list in Spain, the Registro delle opposizioni in Italy, the DGC list in Portugal, the French telephone opt-out list. A fax number is not interchangeable with a voice number: check that the line really is a fax, otherwise you trigger a silent call at a private individual's home.

3. Get the cover page right

This is the page that determines legality in Canada and credibility everywhere else: full sender identity, date and time, subject, number of pages, and the removal mechanism. Our cover page tool and the fax cover page guide provide the structure. For printing templates and acknowledgements, a good-quality pack of 80 gsm A4 paper avoids jams and black pages at the receiving end.

4. Smooth out volumes and respect time zones

A thousand faxes launched simultaneously saturate your channels and cause cascading busy signals. Spread them out, limit retries, schedule according to local time. A UPS for network equipment keeps the gateway alive during the campaign if the site is prone to brief outages; the fallback logic is developed in our fax continuity plan.

5. Keep the transmission evidence

Report per recipient, result code, number of pages, duration. It is this log that will defend you against a complaint as much as against a customer who denies having received anything. For sensitive campaigns, an encrypted external hard drive lets you keep the logs off the workstation, in line with retention periods.

The alternatives that hold up better

In most cases, fax is no longer the right channel for mass communication, even lawful mass communication.

• Canada and Quebec: email with CASL consent, customer portals, and for healthcare flows, the dedicated provincial networks. Fax remains relevant for one-off transmissions to an office that requires it.
• Germany: beA for lawyers, KIM for healthcare professionals, electronic mailboxes of public authorities.
• Italy: PEC, with evidentiary value, for any formal exchange.
• Belgium: eBox for exchanges with the federal administration.
• Spain and Portugal: registro electrónico and equivalent digital one-stop portals.

An overview of the remaining use cases and the migrations is available on the page the end of the PSTN: what happens to my fax, and the channel comparison on fax, email or registered letter. If your goal is only to receive replies, the fax-to-email approach described in receiving a fax by email is simpler than a dedicated machine — a portable document scanner usefully completes the setup for digitising paper replies.

Frequently asked questions

Is a fax to my existing customers marketing?

Not necessarily. An invoice, a delivery note or an appointment reminder falls under performance of the contract. As soon as you add an offer for a different product, you move into marketing — and in Canada, the "existing business relationship" exemption is time-limited and conditional on the absence of a removal request.

Can fax number lists bought online be used?

In practice, no. A purchased file almost never carries proof of valid consent for your purpose, and the GDPR requires that data subjects be informed of the source. In Germany, using such a list for advertising faxes exposes you immediately to a formal warning.

What volume triggers the notion of "bulk sending"?

There is no legal threshold. What matters is the nature of the message (unsolicited commercial) and not the quantity: a single advertising fax without consent is already an infringement in Germany. Volume only aggravates the penalty and the likelihood of being spotted.

Can you send a commercial fax to a number published on a website?

Publishing a number is not consent. At best, it may indicate that the business accepts being contacted about its activity — which does not cover advertising. The German and Italian regulators are clear on this point.

How long should proof of consent be kept?

For the duration of the relationship, plus the applicable limitation period. Authorities expect proof that is contemporaneous with the consent: a screenshot reconstructed after the complaint has no value. Our retention benchmarks are set out in archiving your faxes in 2026.

Key takeaways

• In Canada, the CRTC Rules require express consent or an exemption, mandatory disclosures on the first page, a free removal mechanism, compliance with local hours and record keeping; CASL does not cover fax.
• In the EU, advertising faxes are opt-in as a matter of principle, with Germany extending the requirement to B2B and adding the risk of a formal warning from competitors.
• A free, no-sign-up fax service caps transmissions and does not allow list imports: by design, it is not a mailing platform.
• A defensible bulk transmission rests on a time-stamped consent register, scrubbing against national opt-out lists, a complete cover page, smoothed volumes and retention of transmission reports.
• For mass communication, the official national channels (beA, KIM, PEC, eBox, registro electrónico, Canadian portals) are almost always safer and cheaper than faxing.