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# Notes on Using Internet Fax

This section describes notes on using Internet Fax.

- When using the Internet Fax function, originals are sent at A4 size. Originals larger than A4 are reduced to A4 size. If the receiver's machine is compliant with the T.37 full mode, originals are sent at the size specified in the Address Book.

- When using Internet Fax transmission, documents are sent at “Detail” resolution, even if you have specified “Super Fine”. To send a document at “Super Fine”, configure the Full Mode when registering the destinations in the Address Book.

- If a transmission is not successful, this machine usually receives error notification e-mail. However, error notification e-mail may not be transmitted for various reasons. It is recommended that you confirm receipt of important document by calling the other party.

- The level of security for Internet communications is low. It is recommended that you use the telephone network for confidential communications.

- Voice communication is not supported over a LAN.

- Internet Fax delivery might be delayed due to network congestion. Use Internet Fax transmission that bypasses the SMTP server, a public telephone line fax, or IP-Fax whenever communication time is a concern. For details about using this function, see “Bypassing the SMTP server”.

- If there is a power failure (the main power switch is turned off) or the machine is unplugged for about one hour, all the documents stored in memory are deleted. As soon as the main power switch is turned on, the Power Failure Report is printed to help you check the list of deleted files. Simply turning off the power by pressing the operation switch does not delete stored documents. See “Turning Off the Main Power / In the Event of Power Failure”, Troubleshooting.

- You may not be able to send large files as e-mail, depending on e-mail environment conditions.

- When available memory is low, you may not be able to send Internet Fax documents.

- Because the machine sends documents as e-mail messages with an attached TIFF-F image, viewer applications are required in order to view documents when they are received on a computer.

- With a large volume of document, it may take some time before transmission starts. This is due to the time the machine requires to convert the data in memory.

- POP before SMTP is available in IPv4 environments only.

- For details about the T.37 full mode, see “T.37 Full Mode”.

- T.37 Full Mode

- Bypassing the SMTP server