Fax SMTP – Reference Appendix B: Error Conditions

This page explains how to deal with errors received when sending faxes automatically using our fax SMTP gateway.

The InterFAX service is a hybrid mail/fax server and will issue error messages within the SMTP communication stream, where possible. This provides a standard error-notification mechanism which captures errors, such as unidentified senders or malformed destination addresses, which may be returned immediately to the sender encapsulated as an email error condition.

For a definition of error codes see Interfax Error Codes.