Activate Dynamic screening
Click this check box to activate Dynamic screening.

Advanced
Click this button to open the tarpit.dat file in a text editor. This file lists all IP addresses that have been banned by Automatic IP Screening. You can manually add IP addresses and the number of minutes to ban them by listing them one entry per line in the form: IP_address Minutes. For example, 1.2.3.4 60 .

White list
Click this button to configure IP addresses that are excluded from the Dynamic Screening

Ban senders who cause this many failed RCPT attempts
This is the number of 'Recipient unknown' errors allowed from a given host during a mail session before that host will be automatically banned for the number of minutes specified in the Ban sites for this many minutes option below. Frequent 'Recipient unknown' errors is often a clue that the sender is a spammer since they commonly attempt to send messages to outdated or incorrect addresses.

Ban senders that connect more than [X] times in [X] minutes
Click this check box if you wish to temporarily ban sites that connect to your server an excessive number of times in a limited time period. Specify the number of minutes and the number of connections allowed in that period.

Ban senders that fail this many authentication attempts
Use this option if you wish to temporarily ban sites that fail an authentication attempt a specified number of times. This can help prevent attempts to 'hack' a user account and falsely authenticate a session.

Ban senders for this many minutes
When an IP address is automatically banned, this is the number of minutes that the ban will last. When the ban expires the host will be able to send to you again normally. This feature prevents you from accidentally banning a valid sender permanently.

Close SMTP session after banning site
Enabling this option causes MDaemon to close the SMTP session after the 'Recipient unknown' threshold is reached and the IP address is added to the Tarpitting IP Screen. This switch is enabled by default.

Don't ban senders who use an authenticated session
Click this checkbox if you want senders who authenticate their mail sessions before sending to be exempt from Dynamic Screening.