If you're receiving faxes you don't want - promotional materials, advertising, or repeated junk — here's how to manage them.
Why this happens
Fax numbers are often harvested from public sources (websites, business directories, government registers) and sold to advertisers. Even private fax numbers can end up on commercial fax lists. Junk fax volume varies widely by country and number type.
How to block specific senders
To block a specific sender you can simply add their fax number to a blacklist. For detailed guidance refer to How can I Blacklist a number? Future faxes from that number will be blocked.
How to block all anonymous senders
If you receive a lot of junk faxes from "Unknown" or blocked caller IDs, you can block all anonymous senders.
For detailed guidance refer to How can I block incoming faxes from anonymous senders? This blocks any incoming fax that doesn't include a valid Caller ID.
What gets blocked
- Specific blocked numbers: fully blocked. The sender does not receive a delivery confirmation.
- Anonymous senders (when that setting is on): blocked. Sender sees a busy or rejection.
Important: legal junk fax in some jurisdictions
In the United States, the Telephone Consumer Protection Act (TCPA) prohibits unsolicited commercial faxes in most cases. If you're receiving repeated junk faxes from a US sender, you can file a complaint with the FCC.
In the EU, GDPR provides similar protections.
To reduce junk fax volume long-term
- Avoid posting your fax number on public websites or directories.
- Use one fax number for high-trust contacts and a different one for public registration.
- For Business and Enterprise plans, use multiple numbers and route incoming faxes by number to relevant team members.