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How To Whitelist Hosts/IP Addresses In Postfix

How To Whitelist Hosts/IP Addresses In Postfix

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.

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 8.04 LTS)

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 8.04 LTS)

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 SMTP-AUTH and TLS and quota (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). In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

The Perfect SpamSnake - Ubuntu 8.04 LTS

The Perfect SpamSnake - Ubuntu 8.04 LTS

This tutorial shows how to set up an Ubuntu Hardy Heron (8.04 LTS) based server as a spamfilter in Gateway mode. In the end, you will have a SpamSnake Gateway which will relay clean emails to your MTA. You will also be able to view your incoming queue, train your SpamSnake and carry out a few more advanced operations via MailWatch.

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Mandriva 2008.1)

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Mandriva 2008.1)

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 Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

How to add two-factor authentication to Google Apps for your Domain using open source software

How to add two-factor authentication to Google Apps for your Domain using open source software

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.

Zimbra Collaboration Suite Open Source Edition On CentOS

Zimbra Collaboration Suite Open Source Edition On CentOS

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.

Virtual Users And Domains With Postfix, MailScanner, Mailwatch & MySQL On CentOS 5.1

Virtual Users And Domains With Postfix, MailScanner, Mailwatch & MySQL On CentOS 5.1

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 ...

How To Configure Custom Postfix Bounce Messages

How To Configure Custom Postfix Bounce Messages

Since Postfix version 2.3, Postfix supports custom bounce messages. This guide shows how to configure custom Postfix bounce messages.

Virtual Hosting Howto With Virtualmin On CentOS 5.1

Virtual Hosting Howto With Virtualmin On CentOS 5.1

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.

Automatically Add Disclaimers To Outgoing Emails With alterMIME On Fedora 8

Automatically Add Disclaimers To Outgoing Emails With alterMIME On Fedora 8

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.

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