To use anti-spam option you must specify blacklist hosts, separated by semicolon(;) or comma(,) and set spam checking option to “on”. The program send for each mail request to DNS server on 53 port and receive response to 1053 port. Each request time-out is 2 sec. If host is unavailable the mail status is “not a spam”. Request sends by default to your ISP, and depends on your current DNS configuration. As a rule, there are more than one DNS servers in your TCP/IP configuration. So the program takes a first item from DNS list. Unfortunately, if your primary DNS server is unavailable the antispam feature will be ignored. So if you wish to send request to another DNS server change your current TCP/IP configuration.
This option support only blacklist hosts with DNS response like a.b.c.d A 127.0.0.X, where X in [0..9]
List of recommended DNS-based Spam Databases with 127.0.0.X response:
blackholes.five-ten-sg.com, bl.spamcop.net, sbl-xbl.spamhaus.org, spamguard.leadmon.net, dnsbl.njabl.org,
relays.ordb.org, bl.csma.biz, bl.deadbeef.com, blackholes.mail-abuse.org, dnsbl.antispam.or.id,
dnsbl.cyberlogic.net, dnsbl.sorbs.net, relays.mail-abuse.org, relays.visi.com, relaywatcher.n13mbl.com, sbl.csma.biz
Anti-spam option is not system resources consuming and each mail treatment time will not be more than 2 sec per blacklist host. But recommended amount of spam hosts is 3-6 per user depends on available ISP channel.
If the system detects spam there are following possible actions performs:
1. Modify Subject “Spam from relay: ipaddress.orbl.host”
2. Delete Message on the fly
3. Add header entry “X-ImailZip-Spam: ipaddress.orbl.host”
If you wish to ignore delete message for some mail senders addresses you should specify them in “Trusted” page. There are two ways to configure trusted senders; first is the domain name address configuration. Please refer the following trust pattern to configure senders address:
myfriend1@myhost.com
myfriend2@myhost.com
*@myhost.com
myfriend@myhost.??
Where:
* – any amount of any symbols
? – any one symbol
The second way is to specify an ip-address or group of ip-addresses that the program will ignore.
KillFile
Version 4.3.0.9 and later support KillFile option. To enable KillFile please refer to:
LOCAL_MACHINE\Software\ImailZip [KillFile] parameter
If the following parameter does not exist, create it as a string. Specify the correct path and file name to KillFile. Enter desired e-mail addresses to reject, each address in new line.
* userid@host
For example, to deny access from a user mail account, enter: fred@widget.com
* @host
For example, to deny access to all users from the mail host widget.com, enter: @widget.com
* @*partialhost
For example, to deny mail from any mail host ending in widget.com, enter: @*widget.com. This will reject all mail from widget.com, bluewidget.com, nifty.widget.com, etc.
For more information about file syntax read Ipswitch Imail Server help “Creating and Editing the SMTP Kill file”.
$MiddleDigitUser
Most spam programs generate a random sender’s username in the following format:
\D+\d+\D+
where:
\D+ one or more non-digit symbols
\d+ one or more digit symbols
Enter the $MiddleDigitUser into KillFile to reject user names with this format.
For example:
sdf89sdfg@domain.com – rejected
234sdf@domain.com – ok
kljh345@domain.com – ok
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