http://www.howtoforge.com/taxonomy/term/78/all en http://www.howtoforge.com/themes/htf_glass/images/howtoforge_logo_glass_blue.gif http://www.howtoforge.com/taxonomy/term/78/all http://www.howtoforge.com/the-perfect-spamsnake-ubuntu-8.04 <P><B>The Perfect SpamSnake - Ubuntu 8.04 LTS</b></p> <P>This tutorial shows how to set up an Ubuntu Hardy Heron (8.04 LTS) based server as a spamfilter in Gateway mode.&nbsp;In the end, you will have a SpamSnake Gateway which will relay clean emails to your MTA.&nbsp;You will also be able to view your incoming queue, train your SpamSnake and carry out a few more advanced operations via MailWatch.</p><a href="http://www.howtoforge.com/the-perfect-spamsnake-ubuntu-8.04" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus Ubuntu Postfix Thu, 01 May 2008 18:45:36 +0200 http://www.howtoforge.com/the-perfect-spamsnake-ubuntu-8.04 http://www.howtoforge.com/the-perfect-spamsnake-ubuntu-8.04#comment http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1 <p><b>Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Mandriva 2008.1)</b></p> <p>This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I will also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. In addition to that, this tutorial covers the installation of <b>Amavisd</b>, <b>SpamAssassin</b> and <b>ClamAV</b> so that emails will be scanned for spam and viruses. I will also show how to install <b>SquirrelMail</b> as a webmail interface so that users can read and send emails and change their passwords.</p> <a href="http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus Mandriva Postfix Sun, 13 Apr 2008 19:35:31 +0200 http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1 http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1#comment http://www.howtoforge.com/two-factor-authentication-google-apps-gheimdall <p><b>How to add two-factor authentication to Google Apps for your Domain using open source software</b></p> <p>Everybody loves GMail. With Google Apps for you Domain, you can use GMail with your own domain, allowing organizations to outsource their email - and the requisite anti-spam filtering to Google. Webmail is very convenient, but for frequent travellers and those who use public wifi, it can be quite dangerous. Logging in from a kiosk or shared computer is a sure way to get your username and password stolen by a keystroke logger. Using a public WiFi system can lead to a man-in-the-middle attack. In this document we will take advantage of two open source projects to add two-factor authentication to Google Apps. The first is Gheimdall, a a TurboGears project for Google Apps SSO service. Gheimdall supports PAM and LDAP authentication natively. It also includes sample code to add new authentication methods, which made it very easy to add two-factor authentication from WiKID. WiKID is a dual-source two-factor authentication solution that uses public key cryptography to strongly authenticate users.</p> <a href="http://www.howtoforge.com/two-factor-authentication-google-apps-gheimdall" title="Read the rest of this posting." class="read-more">Read more...</a> CentOS Fedora Email Security Fri, 04 Apr 2008 14:45:47 +0200 http://www.howtoforge.com/two-factor-authentication-google-apps-gheimdall http://www.howtoforge.com/two-factor-authentication-google-apps-gheimdall#comment http://www.howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos <p><b>Zimbra Collaboration Suite Open Source Edition On CentOS</b></p> <p>This tutorial shows how to set up Zimbra Collaboration Suite - Open Source Edition on CentOS. This tutorial covers installation of CentOS, dependencies for ZCS and setup of Split DNS when working behind a firewall. This tutorial is based on the way I set this server up and is only a suggestion. It carries no guarantees and it is highly suggested that you do this on a test server first to verify functionality. If you don't have a test server available you should download VMWare Server 1.0 and perform this tutorial on a test virtual server.</p> <a href="http://www.howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos" title="Read the rest of this posting." class="read-more">Read more...</a> CentOS Email Postfix Tue, 11 Mar 2008 17:37:22 +0100 http://www.howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos http://www.howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos#comment http://www.howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1 <p><b>Virtual Users And Domains With Postfix, MailScanner, Mailwatch &amp; MySQL On CentOS 5.1</b></p> <p>This document describes how to customize Falko's "Virtual Users And Domains" - setup for CentOS 5.1 so that it works with MailScanner and Mailwatch. The resulting system provides a web interface (Mailwatch) where you can manage quarantined emails, train SpamAssassin, edit the white- and blacklist, view configuration files and the detailed MySQL database status ...</p> <a href="http://www.howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus CentOS Email Postfix Thu, 06 Mar 2008 17:59:58 +0100 http://www.howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1 http://www.howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1#comment http://www.howtoforge.com/configure-custom-postfix-bounce-messages <p><b>How To Configure Custom Postfix Bounce Messages</b></p> <p>Since Postfix version 2.3, Postfix supports custom bounce messages. This guide shows how to configure custom Postfix bounce messages.</p><a href="http://www.howtoforge.com/configure-custom-postfix-bounce-messages" title="Read the rest of this posting." class="read-more">Read more...</a> Postfix Wed, 05 Mar 2008 17:36:33 +0100 http://www.howtoforge.com/configure-custom-postfix-bounce-messages http://www.howtoforge.com/configure-custom-postfix-bounce-messages#comment http://www.howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1 <p><b>Virtual Hosting Howto With Virtualmin On CentOS 5.1</b></p> <p> This tutorial shows how to set up a CentOS 5.x server to offer all services needed by virtual web hosters. These include web hosting, smtp server with (SMTP-AUTH and TLS, SPF, DKIM, Domainkeys), DNS, FTP, MySQL, POP3/IMAP, Firewall, Webalizer for stats. </p> <a href="http://www.howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus CentOS Control Panels DNS Email FTP MySQL Postfix Sun, 02 Mar 2008 18:34:44 +0100 http://www.howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1 http://www.howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1#comment http://www.howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8 <p><b>Automatically Add Disclaimers To Outgoing Emails With alterMIME On Fedora 8</b></p> <p>This document describes how to install and configure alterMIME as a Postfix filter on a Fedora 8 system. The resulting system will automatically add disclaimers to outgoing emails.</p> <a href="http://www.howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8" title="Read the rest of this posting." class="read-more">Read more...</a> Fedora Email Postfix Fri, 22 Feb 2008 17:16:44 +0100 http://www.howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8 http://www.howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8#comment http://www.howtoforge.com/exim-mysql-cyrus-imapd-horde-centos5.1 <p><b>Mail Server Setup With Exim, MySQL, Cyrus-Imapd, Horde Webmail On Centos 5.1</b></p> <p> This how to describes the installation and configuration of a mail system on Centos 5.1 with selinux enabled for enhanced security. This system will be able to service HTTP, HTTPS, SMTP, TLS, SMTP-AUTH, IMAP, POP3 clients and is virtual enabled allowing more than one domain to be served from the system. </p> <a href="http://www.howtoforge.com/exim-mysql-cyrus-imapd-horde-centos5.1" title="Read the rest of this posting." class="read-more">Read more...</a> CentOS Email Tue, 19 Feb 2008 18:04:11 +0100 http://www.howtoforge.com/exim-mysql-cyrus-imapd-horde-centos5.1 http://www.howtoforge.com/exim-mysql-cyrus-imapd-horde-centos5.1#comment http://www.howtoforge.com/zimbra-collaboration-suite-5.0-on-debian-etch <p><b>Zimbra Collaboration Suite (ZCS) Open Source Edition v5.0 On Debian Etch</b></p> <p>This document describes how to set up the Zimbra Collaboration Suite (ZCS) Open Source Edition v5.0 on Debian Etch. The resulting system provides a full featured collaboration-suite with many features that I can't list all here - please have a look at the feature list. It also comes with a nice (themeable) AJAX web interface for administration and user access.</p> <a href="http://www.howtoforge.com/zimbra-collaboration-suite-5.0-on-debian-etch" title="Read the rest of this posting." class="read-more">Read more...</a> Debian Control Panels Email Sun, 10 Feb 2008 18:10:12 +0100 http://www.howtoforge.com/zimbra-collaboration-suite-5.0-on-debian-etch http://www.howtoforge.com/zimbra-collaboration-suite-5.0-on-debian-etch#comment http://www.howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1 <p><b>How To Implement Domainkeys In Postfix Using dk-milter</b></p> <p>Domainkeys is "<i>DomainKeys is a method of e-mail authentication. Unlike some other methods, it offers almost end-to-end integrity from a signing to a verifying Mail Transfer Agent (MTA). In most cases the signing MTA acts on behalf of the sender, and the verifying MTA on behalf of the receiver. DomainKeys is specified in Historic RFC 4870, which is obsoleted by Standards Track RFC 4871, DomainKeys Identified Mail (DKIM) Signatures.</i>" according to the wikipedia. So why a how to on it when there is DKIM ? Well domainkeys is still actively being used and is more widely deployed than DKIM, the developer Yahoo still uses it to sign and verify mail although they are contributers to the DKIM standard.</p> <a href="http://www.howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus CentOS Postfix Fri, 01 Feb 2008 16:53:59 +0100 http://www.howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1 http://www.howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1#comment http://www.howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1 <p><b>Set Up Postfix DKIM With dkim-milter</b></p> <p>DKIM is an authentication framework which stores public-keys in DNS and digitally signs emails on a domain basis. It was created as a result of merging Yahoo's domainkeys and Cisco's Identified Internet mail specification. It is defined in RFC 4871.</p> <a href="http://www.howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus CentOS Postfix Wed, 30 Jan 2008 17:18:02 +0100 http://www.howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1 http://www.howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1#comment http://www.howtoforge.com/mailscanner-exim-gateway-with-communigate-pro <p><b>Mailscanner/Exim Gateway With Communigate PRO Guide</b></p> <p>In this tutorial we will be installing and setting up Mailscanner as a mail firewall in front of a Communigate pro cluster. This tutorial has been written for the CENTOS 5.x Linux distro but am sure it can be used for any other Linux based system with little modifications. The system will run with SELinux in enforcing mode.</p><a href="http://www.howtoforge.com/mailscanner-exim-gateway-with-communigate-pro" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus CentOS Fri, 25 Jan 2008 15:25:50 +0100 http://www.howtoforge.com/mailscanner-exim-gateway-with-communigate-pro http://www.howtoforge.com/mailscanner-exim-gateway-with-communigate-pro#comment http://www.howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue <p><b>How To Delete Mails From Or To A Specific Email Address From Your Mail Queue (Postfix)</b></p> <p>If you get hit by a spam attack that floods your server with hundreds/thousands of emails from the same sender email address or to the same recipient email address, you can clean your mail queue from these emails with one single command before the mail flood takes your server to its knees.</p> <a href="http://www.howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue" title="Read the rest of this posting." class="read-more">Read more...</a> Postfix Tue, 15 Jan 2008 12:04:33 +0100 http://www.howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue http://www.howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue#comment http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0 <p><b>Virtual Users And Domains With Postfix, Courier And MySQL (Mandriva 2008.0)</b></p> <p>This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. The resulting Postfix server is capable of <b>SMTP-AUTH</b> and <b>TLS</b> and <b>quota</b> (quota is not built into Postfix by default, I'll show how to patch your Postfix appropriately). Passwords are stored in <b>encrypted</b> form in the database (most documents I found were dealing with plain text passwords which is a security risk). In addition to that, this tutorial covers the installation of <b>Amavisd</b>, <b>SpamAssassin</b> and <b>ClamAV</b> so that emails will be scanned for spam and viruses.</p> <a href="http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus Mandriva Postfix Sun, 13 Jan 2008 18:16:05 +0100 http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0 http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0#comment