Configuration tab

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The following global options are available. They apply to all emails processed by SpamFilter:

Figure 1

Figure 1

 

SMTP listener socket
oIP(s) - SpamFilter can be configured to listen on a specific IP, multiple IPs (separate the IPs with a comma in the IP input box), or all IPs (leave the IP field blank).
oPort - The port on which SpamFilter will listen on. 25 is the standard SMTP port.
oSSL Port - SpamFilter supports SSL with SMTP. The standard SSL port is 465, however SSL is disabled by default by setting the port to 0. Please see the SSL certificates section for more information about using your own certificates.
oFQDN - This is the Fully Qualified Domain Name that SpamFilter will output in the welcome banner sent to initiating connections.
oDestination Server
oName - The name or IP address of the default server where your email will be forwarded to. Please note that this default value can be overridden for individual domains if you need to have multiple routes for your domains. Please see the section on Local Domains for more info.
oPort - The port on which email will be forwarded to. Having a port other that 25 can be useful in situations where you only have access to a single IP. If you configure your destination MTA server to listen on a port other than 25, you can have both SpamFilter and your MTA co-exist on a single IP address.
Note - if the destination server is unavailable, emails are saved to the queue directory. Redelivery of items in the queue is attempted every 60 minutes, and also every time SpamFilter is started.
DNS Server
oIP(S) - Enter the IP of your DNS server here. You can enter multiple DNS servers for redundancy by separating them with commas.
Global Options
oMax concurrent incoming SMTP connections - You can limit the maximum number of concurrent incoming connections here.
oMax concurrent incoming SMTP connections from single IP- You can further limit the maximum number of concurrent connections originating from an single IP address with this setting.
oMax Recipients in single session - Use this setting to limit how many RCPT TO commands can be issued in a single session. Enter a value of “0” to disable this setting.
oMax Email Size - Incoming emails can be blocked if they exceed a certain size. Enter a “0” to disable this setting.
oProcess queue every n minutes - Use this setting to control how often SpamFilter attempts to redeliver the items on hold in the queue directory.
oEnable Cached IP Blocking - If an IP address sends more than a certain number of spam emails (3 by default) during a certain time interval (10 minutes by default), then it can be temporarily banned (blacklisted). All further connections from that IP address will be immediately rejected without allowing the sender to transmit any data. This should greatly reduce the load on the server. A banned IP address will be automatically removed from this temporary blacklist after a defined time interval (60 minutes by default). To prevent specific IPs to be added to this list, they can be added to DoNotAddIPToHoneypot SpamFilter.ini option.
oEnable GreyListing Filtering - Greylisting initially denies every connection attempt from an IP address. Only after a certain, small amount of time is the remote IP allowed to connect. If the sender is a spam bot, it is very likely that said IP will never retry to connect again, and so it will not even try to send spam. If the sender is a legitimate server, they will be following the RFC guidelines, and within a few minutes they will retry sending the email, which will be then delivered.
oLogging - Check this box to enable logging in the log directory.
oAuto-check for new build - If checked SpamFilter will connect with our website to see if a new version of the software is available. SpamFilter will issue a simple GET request to http://logsat.com/spamfilter/version.htm to retrieve the current version number.
oDisable Connections Grid - The Connections tab will show you in real-time what the various connections on your servers are and what they are doing. If you have a busy site with 500 concurrent connections this list can get pretty crowded and could affect performance. This feature can thus be disabled from here.
oRemember Stats - Check this box to save the email statistics when shutting down SpamFilter.