RUTM16 Email Relay

The information in this page is updated in accordance with firmware version RUTM_R_00.07.23.5.

Summary

Email Relay is an e-mail store-and-forward message transfer agent and proxy server. The service does three things:

• Stores any incoming e-mail messages that it receives
• Forwards e-mail messages on to another remote e-mail server
• Serves up stored e-mail messages to local e-mail reader programs

More technically, it acts as a SMTP storage daemon, a SMTP forwarding agent, and a POP3 server.

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This manual page provides an overview of the Email Relay functionality in RUTM16 devices.

Note: Email Relay is additional software that can be installed from the System → Package Manager page.

Email Relay Configuration

This section displays Email Relays that are currently configured on the router. By default the list is empty. To add a new email relay press 'Add' button.

Server configuration

Field	Value	Description
Enable	off | on; default: off	Enables this email relay instance.
Mode	Server | Proxy | Command line; default: Server	Instance mode.
SMTP port	integer [1..65535]; default: none	SMTP Port to listen incoming connections.
POP port	integer [1..65535]; default: none	POP Port to listen incoming connections.
Remote clients	off | on; default: off	To allow connections from anywhere. By default only local allowed.
Address verifier	string; default: none	Runs the specified external program to verify a message recipient's e-mail address.
Domain	domain name; default: none	Specifies the network name that is used in SMTP EHLO. The default is derived from a DNS lookup of the local hostname.
Anonymous	off | on; default: off	Disables the server's SMTP VRFY command. For improved security it is not advised to enable SMTP VRFY.
Server TLS	off | on; default: off	Enables TLS for incoming SMTP and POP connections. For improved security it is advised to turn on Server TLS.
TLS certificate	.pem certificate; default: none	Specifies a PEM-format file containing a X.509 certificate and private key.
SMTP authentication	off | on; default: off	Enables SMTP server authentication of remote SMTP clients. For improved security it is advised to enable SMTP authentication. For improved security it is advised to enable SMTP authentication.
SMTP Username	string; default: none	Username for authentication with the SMTP server.
SMTP Password	string; default: none	Password for authentication with the SMTP server.
POP Username	string; default: none	Username for authentication with the POP server.
POP Password	string; default: none	Password for authentication with the POP server.

Proxy configuration

Field	Value	Description
Enable	off | on; default: off	Enables this email relay instance.
Mode	Server | Proxy | Command line; default: Proxy	Instance mode.
SMTP port	integer [1..65535]; default: none	SMTP Port to listen incoming connections.
Remote clients	off | on; default: off	To allow connections from anywhere. By default only local allowed.
Address verifier	string; default: none	Runs the specified external program to verify a message recipient's e-mail address.
Domain	domain name; default: none	Specifies the network name that is used in SMTP EHLO. The default is derived from a DNS lookup of the local hostname.
Anonymous	off | on; default: off	Disables the server's SMTP VRFY command. For improved security it is not advised to enable SMTP VRFY.
Server TLS	off | on; default: off	Enables TLS for incoming SMTP and POP connections. For improved security it is advised to turn on Server TLS.
TLS certificate	.pem certificate; default: none	Specifies a PEM-format file containing a X.509 certificate and private key.
SMTP authentication	off | on; default: off	Enables SMTP server authentication of remote SMTP clients For improved security it is advised to enable SMTP authentication. For improved security it is advised to enable SMTP authentication.
SMTP Username	string; default: none	Username for authentication with the SMTP server.
SMTP Password	string; default: none	Password for authentication with the SMTP server.
Smarthost	ip:port | domain name:port; default: none	Specify the SMTP to forward emails.
Client TLS	off | on; default: off	Enables negotiated TLS for outgoing SMTP connections. For improved security it is advised to enable Client TLS.
Client authentication	off | on; default: off	Enables SMTP client authentication with the remote server. For improved security it is advised to enable Client authentication.
Username	string; default: none	Username for authentication with the remote server.
Password	string; default: none	Password for authentication with the remote server.

Command line

Field	Value	Description
Enable	off | on; default: off	Enables this email relay instance.
Mode	Server | Proxy | Command line; default: Command line	Instance mode.
Extra command line	string; default: none	Extra command line options.