Configuring the SMTP Server

Configuring the SMTP Server

To configure the SMTP server:

Expand the Services folder in the left panel and click on SMTP.
Click on the SMTP tab in the right panel. The SMTP tab appears in the right panel.

Enter the options you want to use to configure the SMTP server. Each option is described below.
Click Apply to save your changes.
After making changes, stop the SMTP service, wait 5-10 seconds and restart the service. Any changes that you make are saved automatically as soon as you click Stop/Start Service.

Logging Options

In the Log To box, select the file that you want to use for logging SMTP events.

No Log disables logging.
SYSMMDD.TXT causes all inbound and outbound mail to be logged in the file: [IMail Top Directory]/spool/sysmmdd.txt, where mm is the month and dd is the day the log was written.
App Log causes inbound mail to be logged in the Application Log, which is viewed with the Windows Event Viewer.
Log Server (the default setting) causes messages to be sent to the Log Server IP address specified on the Log Server address box on the Localhost General tab.

Other Options

Debug Messages. When turned on, writes debug messages to the log file.

Verbose Logging. Records more information than standard logging. It can create very large log files, however, is helpful in troubleshooting problems.

Default Mail Host. The name of the host to send mail to if only a user ID is specified in the mail message and that user ID is not found on the local system. Normally this field should be blank. This field can be useful when multiple systems are required to work as one system.

Domain Name Server address. The IP address of the system that provides domain name service for your network. You can enter multiple name servers here, separated by a space. This option is required in order to send mail externally.

SSL Options:

Enable Dedicated SSL Listener. Select to enable a dedicated port that accepts only SSL encrypted connections from the SMTPD service. You can change the default port used by the SSL Listener in the SSL Port box.
SSL Port. (default port is 25) Enter the port used by the dedicated SSL Listener to accept connections.
Enable TLS. Select to enable the SMTPD service to accept SSL/TLS connections over the SMTPD port through use of the STARTTLS command.

Tries before returning to sender. The number of times that delivery is attempted before giving up and returning the mail to the sender. Each time the Retry Timer (on the Queue Manager tab) reaches 0, a delivery attempt is made. Thus, if the Retry Timer is set to 30 (minutes) and you want to attempt delivery for up to 3 days, this field should contain 144. The default value is 20.

Null sender maximum tries. The maximum number of times that IMail will attempt to deliver a message that has no sender (including postmaster messages). This value must be less than the value entered for "Tries before returning to sender". If the "Tries before returning to sender" value is less than the value entered here, the "Null sender maximum tries" option is not enforced.

Delete after maximum tries. Deletes mail messages that have no sender if they fail to be delivered after the maximum number of tries.

Server Status. A status message to the left of the Start/Stop button shows the version number, and whether or not the service is running. The button switches between Start and Stop depending on whether or not the service is running.

Using a Remote Mail Gateway

You can use the following Gateway Options to configure your mail server to use a remote mail gateway.

Remote Mail Gateway Host. The name of another host to send mail to for further delivery when that mail cannot be delivered directly to the destination host. This can be used in conjunction with the Send all remote mail through gateway option to force delivery of mail through the gateway host. Since IMail Server should be able to reach all hosts directly, this field should typically be blank.

Send all remote mail through gateway. Causes IMail Server to send all mail to the Remote Mail Gateway Host, which forwards it on to the addressee's mail host. If this option is not selected, IMail Server will send mail directly to the addressee's mail host.

Tries before sending to gateway. The number of times that delivery directly to a remote host should be attempted before giving up and delivering to the gateway host. Proper function of this value is dependent on the validity of the Remote Mail Gateway Host name and the Send all remote mail through gateway option.

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