http://howtoforge.com/taxonomy/term/4/all &nbsp; en http://www.howtoforge.com/themes/htf_glass/images/howtoforge_logo_glass_blue.gif http://howtoforge.com/taxonomy/term/4/all http://howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix <p><b>How To Whitelist Hosts/IP Addresses In Postfix</b></p> <p>If you are administrating a mail server and use blacklists to block spam, you probably know this problem: from time to time your customers complain that they cannot receive emails from certain freemailers. Most often this happens because a freemailer was abused to send out spam and therefore got blacklisted. This short guide shows how you can whitelist such a mail server in Postfix to make your customers happy again.</p> <a href="http://howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix" title="Read the rest of this posting." class="read-more">Read more...</a> Postfix Tue, 10 Jun 2008 12:07:05 +0200 http://howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix http://howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix#comment http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04 <p><b>Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 8.04 LTS)</b></p> <p>This document describes how to install a mail server based on Postfix 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. 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://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus Ubuntu Postfix Tue, 20 May 2008 18:13:58 +0200 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04#comment http://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://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://howtoforge.com/the-perfect-spamsnake-ubuntu-8.04 http://howtoforge.com/the-perfect-spamsnake-ubuntu-8.04#comment http://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://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://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-mandriva2008.1#comment http://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://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://howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos http://howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos#comment http://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://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://howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1 http://howtoforge.com/virtual-users-domains-postfix-mailscanner-mailwatch-centos5.1#comment http://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://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://howtoforge.com/configure-custom-postfix-bounce-messages http://howtoforge.com/configure-custom-postfix-bounce-messages#comment http://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://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://howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1 http://howtoforge.com/virtual-hosting-with-virtualmin-on-centos5.1#comment http://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://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://howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8 http://howtoforge.com/add-automatic-disclaimers-to-outgoing-emails-with-altermime-postfix-fedora8#comment http://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://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://howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1 http://howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1#comment http://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://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://howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1 http://howtoforge.com/postfix-dkim-with-dkim-milter-centos5.1#comment http://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://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://howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue http://howtoforge.com/delete-mails-to-or-from-a-specific-email-address-from-postfix-mail-queue#comment http://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://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://howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-mandriva2008.0#comment http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-roundcube-ubuntu-6.06 <p><b>Virtual Users And Domains With Postfix, Courier And MySQL (Ubuntu 6.06 LTS)</b></p> <p>This document describes how to install a mail server based on Postfix 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 encrypted form in the database (most documents I found were dealing with plain text passwords which is a security risk).</p> <a href="http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-roundcube-ubuntu-6.06" title="Read the rest of this posting." class="read-more">Read more...</a> Anti-Spam/Virus Ubuntu Postfix Thu, 10 Jan 2008 12:38:10 +0100 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-roundcube-ubuntu-6.06 http://howtoforge.com/virtual-users-domains-postfix-courier-mysql-roundcube-ubuntu-6.06#comment http://howtoforge.com/add-disclaimers-to-outgoing-emails-with-altermime-postfix-debian-etch <p><b>How To Automatically Add A Disclaimer To Outgoing Emails With alterMIME (Postfix On Debian Etch)</b></p> <p>This tutorial shows how to install and use alterMIME. alterMIME is a tool that can automatically add a disclaimer to emails. In this article I will explain how to install it as a Postfix filter on Debian Etch.</p> <a href="http://howtoforge.com/add-disclaimers-to-outgoing-emails-with-altermime-postfix-debian-etch" title="Read the rest of this posting." class="read-more">Read more...</a> Debian Postfix Mon, 07 Jan 2008 17:39:22 +0100 http://howtoforge.com/add-disclaimers-to-outgoing-emails-with-altermime-postfix-debian-etch http://howtoforge.com/add-disclaimers-to-outgoing-emails-with-altermime-postfix-debian-etch#comment