SMTP OPTIONS
This screen allows you to define how SMTPD will receive the messages coming from the Internet through configuring the different SMTPD options. To configure, follow the steps given below.
Enter values for the following fields:
- Maximum SMTPD sessions
The maximum number of connections that SMTPD can handle. Some Winsock stacks find it difficult to handle too many incoming SMTPD sessions. A value of zero indicates that there is no preset maximum value. This field has the default value of 15.
- SMTPD greeting message
The string test which will be used to customize the welcome/greeting message displayed when SMTPC logs in. This feature is very useful for customizing your company's personal message greeting message preference and for security purposes so as not to disclose the mail server product information.
- Tick the check boxes of the options you wish to activate:
- Reject unqualified address
When enabled, SMTPD will check the recipient and sender addresses for a proper domain part, and reject the message if it doesn't have a domain part, e.g. user@ima.com is accepted but user alone is rejected. The default is disabled.
- Qualify address
When this option is enabled, SMTPD will automatically append the local domain part to the unqualified address. The default is enabled.
- Reject remote recipients
When this option is enabled, SMTPD will reject incoming messages for remote Internet recipients. This is to prevent remote sites from trying to spoof messages by re-routing their messages through IEMS back to the Internet. The default is disabled.
- Kill SMTPD zombie
Activate this option if you wish SMTPD to close the socket it uses when it shuts down prematurely. Through this, SMTPD will not get an address that is already in use when re-started. The default is enabled.
- Disable VRFY command
The VRFY (verify user) command is sometimes considered too intrusive. Through this command, a remote host may confirm whether a particular user exists in a certain post office. Disabling the VRFY command causes SMTPD to respond with a 252 command disabled when a remote SMTP client issues this command. This option is disabled by default.
- Disable EXPN command
For security reasons, the EXPN (expand mailing list) command is sometimes considered too intrusive. Through this command, a remote host may confirm whether a certain mailing list exists in a certain post office. Disabling the EXPN command causes SMTPD to respond with 550 command disabled when a remote SMTP client issues this command. This option is disabled by default.
- Maximum number of messages can be sent/relayed per day by a SMTP authenticated user
The maximum number of messages that can be sent/relayed in one day by a SMTP authenticated user. The default is Unlimited.
- Maximum size of total messages (M Bytes) can be sent/relayed per day by a SMTP authenticated user
The maximum size of total messages (M Bytes) that can be sent/relayed in one day by a SMTP authenticated user. The default is Unlimited.
- Click the Submit button to save the new settings. Restart the SMTPD module to implement the new settings.