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# Bypassing the SMTP server

You can send Internet Fax documents directly to their destinations without going through the SMTP server.

Normally, Internet Fax is sent through the SMTP server. With this feature however, the domain part of the destination's e-mail address is read as the SMTP server's address and transmissions bypass the SMTP server. Since this reduces the load on the server, you can send Internet Faxes without having to take into account the transfer time from server to destination.

- To use this function, the following settings must be specified:

  - In “System Settings”, “SMTP Server”, in “File Transfer”, set the port number to “25”.

  - To specify the host name of the other party as the domain part of the e-mail address, register the host name of the other party on the DNS server.

  - For details about these settings, see “File Transfer”, Network and System Settings Reference.

- If the other party's IP address is not registered on the DNS server, specify the IP address at the domain part of the e-mail address.

- To send a document over an IPv6 network, you must specify the other party's host name (not IP address) as the domain part.

- To use this function, the other party's fax machine must:

  - be compatible with Internet Fax

  - be connected to the same LAN as this machine

  - support SMTP reception and have its reception protocol set to SMTP

- SMTP authentication set on the other party's fax machine is disabled when Internet Fax is transmitted using this function.

- If an Internet Fax is transmitted from the other party using this function, even if reception fails, Error Mail Notification is not sent to the sender.

- When an Internet Fax is transmitted using this function, even if transmission fails, the server does not send error notification e-mail.

- When using this function, you cannot send Internet Fax to the administrator e-mail address that is registered on this machine.

There are two ways of specifying a destination, as follows:

By specifying the other party's host name

Specify a destination's e-mail address by adding the other party's host name to the domain part of the e-mail address. Specify the address after the @ as follows: “host name”, “. (dot)”, and “domain name”.

xxxx@host name of the other party.domain name

For example, if the other party's e-mail address is “abc@defcompany.com” and the host name is “HOST”:

abc@HOST.defcompany.com

By specifying the other party's IP address

Specify a destination's e-mail address by changing the domain part of the e-mail address to the other party's IP address.

xxxx@[the other party's IP address]

For example, if the other party's e-mail address is “abc@defcompany.com” and the IP address is “192.168.1.10”:

abc@[192.168.1.10]

Use the following procedure to bypass the SMTP server.

Press [Internet Fax] to switch the transmission type to Internet Fax, and then specify a destination.

Press [SMTP].

Press [No].

Press [OK].

- If you use [Manual Entry] to specify the destinations directly, you can also specify whether or not to use SMTP server for each destination.

- If you use the destination list to select the destinations, the SMTP server setting specified in the Address Book is enabled. For details about making the SMTP server settings in the Address Book, see “Registering Addresses and Users for Facsimile/Scanner Functions”, Network and System Settings Reference.

- To send Internet Fax documents from a computer, use LAN-Fax Driver to specify whether or not to bypass the SMTP server. When sending with the [Use device address] check box selected, the SMTP server setting specified on this machine is enabled.