This article decodes every major Fax 2 Mail error code, explains why they happen, and provides step-by-step solutions for users, IT administrators, and business owners.
Most error codes fall into two families:
These errors occur after the handshake succeeds, while the document is actively being sent. fax 2 mail error codes
: Output Window Timeout. A timeout occurred before the line even started ringing, usually indicating a carrier-level issue. 2. Number & Routing Errors
Sending from New York to Tokyo involves multiple telecom carriers. Each carrier’s switch can alter the fax tone. This article decodes every major Fax 2 Mail
| Error Code | Description | Possible Causes | Recommended Action | |------------|-------------|----------------|---------------------| | | Invalid recipient email address | Email address missing @ or domain, contains spaces, or is malformed | Verify and correct the email address in the fax routing settings | | E002 | Email attachment size exceeds limit | Fax pages + resolution > system limit (e.g., >10 MB) | Reduce fax resolution (e.g., from 300 DPI to 200 DPI) or split multi-page fax | | E003 | Mailbox full / Quota exceeded | Recipient’s email server rejecting due to insufficient storage | Recipient must clear mailbox space or increase quota | | E004 | SMTP server timeout | Network latency, email server unresponsive, or wrong SMTP port | Retry delivery; check SMTP server status and firewall rules | | E005 | Authentication failed | Incorrect username/password for SMTP relay | Update credentials in fax-to-mail configuration | | E006 | Unsupported file format | System failed to generate PDF/TIFF from fax | Re-convert the fax; check for corrupted fax data | | E007 | Sender’s email domain blocked | Recipient’s email server blacklisted the sending domain | Add sending domain to allowlist; check DNS blacklists | | E008 | No T.30 fax protocol handshake | Incoming call was not a fax (e.g., voice call) | Ensure sending machine is set to fax mode; test with known fax device | | E009 | Disk write error on mail server | Insufficient disk space or permission issue on fax gateway | Free disk space or repair directory permissions | | E010 | Invalid SMTP response code (e.g., 550, 554) | Recipient mail server rejected the message (spam, policy, or relay denied) | Review SMTP logs; check recipient’s spam filters and email policies |
Provide the following information to your Fax to Mail provider: A timeout occurred before the line even started
In the modern business landscape, the bridge between traditional analog communication and digital workflows is often built by "Fax to Mail" (or "Fax 2 Mail") services. These systems allow users to send a fax that arrives as a PDF attachment in an email inbox, or to send an email that transmits as a traditional fax. It is a seamless technology—until it isn't.
These errors occur when the fax server attempts to call the destination number but fails to establish a connection.
: The recipient's fax machine is currently in use or receiving a high volume of faxes. Wait a few minutes and retry. RING_TO / NOAN
Below is a breakdown of the most common Fax2Mail error codes and status messages to help you get your documents through. 1. Common Connection & Busy Status Codes