Delaying the SMTP greeting

An SMTP greeting message can be delayed for a specified time interval, so that a connection from a client will be dropped if the client tries to send data during this time interval. This option can help prevent mail from spam-sending applications that send a high volume of messages very quickly. The connection is dropped as soon as a message is sent to the SMTP server before it is ready. This feature is not enabled by default, but can be enabled from the section SMTP Greeting Delay Options on the page Settings > Inbound/Outbound > Connection Control.

Configure the SMTP greeting delay

Steps

  1. Navigate to the page Settings > Inbound/Outbound > Connection Control.
  2. From the section SMTP Greeting Delay Options, mark the check box Enable SMTP greeting delay.
    Selection enables the corresponding field.
  3. In the text field Delay time, specify the delay time, in seconds, from 1–60. The default is 3 seconds.
  4. Save detailed connection information in the appliance mail processing log; mark the check box Save connection details in the mail processing log.
  5. Click OK.
    The settings are saved.