Note: the Spamhaus project is at http:/www.spamhaus.org and describes a test which can be run to verify that the DNS RBL filter is working.

If Default is selected, choose the level of filtering (note that the default filter is subjective and may filter too many messages or too few messages for your liking) Note: the Content Filters are quite aggressive and will filter messages that do not use strict MIME format. Due to the large number of mailers which fail to conform to MIME, Content Filters may result in significant false positives and should be used only when senders are known to conform to MIME.

Set the Initial Block Period to the number of minutes to block messages with unlisted IP/sender/receiver values. The default is 60 minutes. If set to 0, messages will be delivered more quickly, but Greylisting may be less effective Set the Block Period Lifetime to the number of minutes that an unlisted IP/sender/receiver will be temporarily stored pending another message with the same IP/sender/receiver values.

ISMail Pro setup instructions are also available in the ISMail Pro User Guide (on-line or within the product). Some of the individual setup options are also discussed in this FAQ. Once ISMail is setup, run the ISMail Setup Test (a.k.a. Basic Access Test) to check that ISMail Pro is working, the mail servers are accessible from the internet, and the DNS settings are correct for the domain(s).

Blacklists and Whitelists can be setup at the server, domain, or user account level. Server-level blacklists and whitelists affect all messages; domain-level and user account-level blacklists and whitelists only affect messages to or from specific domains or user accounts, respectively. On the 'Content Filter' line, click the button labeled with this domain name (Note: clicking the 'All Domains' button is an alternate way of selecting the server-level blacklists and whitelists)

Set the Initial Block Period to the number of minutes to block messages with unlisted IP/sender/receiver values. The default is 60 minutes. If set to 0, messages will be delivered more quickly, but Greylisting may be less effective Set the Block Period Lifetime to the number of minutes that an unlisted IP/sender/receiver will be temporarily stored pending another message with the same IP/sender/receiver values.

Blacklists and Whitelists can be setup at the server, domain, or user account level. Server-level blacklists and whitelists affect all messages; domain-level and user account-level blacklists and whitelists only affect messages to or from specific domains or user accounts, respectively. On the 'Content Filter' line, click the button labeled with this domain name (Note: clicking the 'All Domains' button is an alternate way of selecting the server-level blacklists and whitelists)

ISMail setup instructions are also available in the ISMail User Guide (on-line or within the product). Some of the individual setup options are also discussed in this FAQ. Once ISMail is setup, run the ISMail Setup Test (a.k.a. Basic Access Test) to check that ISMail is working, the mail servers are accessible from the internet, and the DNS settings are correct for the domain(s).

ISMail Pro is a mail server for Windows PCs. It supports ESMTP, POP3, IMAP4, Webmail on multiple domains with anti-spam, backup, relay, remote administration, and other features.

To use ISMail Pro with ClamAV, download and install the ClamAV system and then configure ISMail Pro to use ClamAV as follows: Update ClamAV virus definition files automatically using the 'freshclam.exe' utility. This can be done by running 'freshclam.exe' (e.g. c:\program files\clamAV\freshclam.exe) in the Windows scheduler on a daily basis. Run 'freshclam.exe' manually to initialize the virus database (c:\Program Files\clamAV\freshclam.exe).

No, but a static IP address is highly recommended and is a de facto requirement if ISMail Pro is used on the internet.

The trial copy will, however, display a License Manager window whenever it is started, and will expire after a limited period of time. Click 'OK' in the License Manager window to run the trial version of ISMail Pro.

The ISMail Pro default configuration does not allow open relaying, thus preventing a major source of spam. Senders must be authenticated to send messages to remote domains. ISMail Pro does not accept messages unless the account name is valid or unless a special 'catch all' account is defined. This reduces 'bounce' traffic considerably. ISMail Pro allows access to the server machine on ports 25 (SMTP), 110 (POP3), and 143 (IMAP4). Access is handled by these server programs.

If you are having trouble both sending and receiving mail, first see Troubleshooting (problems sending mail) and then see Troubleshooting (problems receiving mail).

The Realtime Blackhole List (RBL) is a blacklist on the Internet, made available under the umbrella of the Mail Abuse Prevention Systems (MAPS). It lists unprotected mail servers that are used by spammers for sending unsolicited mail. Mail servers using the RBL can deny communications with the listed systems. Because spammers are making increasing use of open client systems with changing IP addresses, the effectiveness of RBL has seen a sharp decline recently.

The DNSBL (DNS BLacklist) databases collect IP addresses of spammer servers, open relay mail servers, open proxies, spam-supporting ISPs, dial-up lines, etc. that are known or possible spam sources. As their name implies, DNS blacklist databases can be queried using DNS lookups. Often they are also referred as RBL's (Realtime BLackhole) or ip4r databases.

An MX record pointing to the host name of the backup ('secondary') mail server, and an A record defining the IP address of the host name of the backup ('secondary') mail server must be added to the DNS for the domain name. The priority of the MX record for the secondary should be lower (i.e. numerically higher) than the priority for the primary MX record.

Spam filters are easy to setup using our standard filter templates. You can add spam filters in 5 easy clicks. ReliaNET Spam Filters must be setup using ReliaNET WebMail service at https://email.relia.net. Once you log in using your username and password you will click on the 'Options' link and choose 'Spam Filters'. Then click on 'Add Standard' and choose any/all filters that you would like to apply.