The number is formatted incorrectly or has been blocked by the provider.

Some recipients have notoriously bad fax lines. When resending to them, manually enable “low resolution” (100 DPI) and “direct send” mode in your provider’s portal.

Faxing might feel like a relic of the past, but for many industries like healthcare and law, it remains a vital, secure tool. When using a (or email-to-fax) service, the physical hum of a fax machine is replaced by digital status reports and cryptic error codes. Understanding these codes is essential for ensuring your documents reach their destination without delay.