SMTP authentication is important because you may use it to verify mail clients independent of their IP Addresses.  Without SMTP Authentication only those IP ranges indicated in the mynetworks parameter will be allowed to connect. So here is how it works with mynetworks. If you had a setting in the Postfix main.cf that looked like the one below, the Postfix mail server at localhost could relay mail and all those machines on the subnet that is listed ...

The environmental variables in CCARGS for instance, provide the options that Postfix needs. AUXLIBS – If you build support for any additional applications you may need to tell the linker where to look for the additional libraries for those programs.  The standard location for system libraries is /usr/lib.  If you want the linker ...

CentOs MySQL Support You may want to use MySQL to store passwords of accounts, especially when you are working with virtual mailboxes.  One thing to note when you do compile Postfix is to make good use of the READMEs are they are very helpful. Be sure that the paths are correct for your distro.  Here you can see the changes necessary ...

Building Postfix from source can be a rewarding experience with great results.  This tutorial will show you how to do a basic build and then following tutorials will show you how to build in additional features. Download Source Code From Here: http://www.postfix.org/download.html When you download the source and unpack it you ...

The postcont -n command for Postfix shows you changes made to the default configuration.  Here is a listing of the new Ubuntu 9.10 and the output for Postfix.  As you can see nothing too significant except you see a focus on TLS for secure communication which is great, however this really needs to be addressed for users from the client ...

There are default mailbox sizes which may lead to mail delivery failure when you go beyond the defaults.  In order to avoid problems you need to understand the difference between mailboxes and virtual_mailboxes as well as know the default sizes and how to adjust them. Here is the error that you want to avoid: mailbox /var/spool/vmaill/vmail/1: error writing message: File too large Mailbox Size Limit Default mailbox size is 50 MB.  This ...

Recently we asked administrators why they used Postfix Mail Server.  Here are some of the responses: "Being able to manage users and pretty much all mail aspects from a MySQL table" "Security.  Postfix is rock solid and I do not have to worry about the security of the system once it is set up correctly" "Flexibility!" "I've been running Postfix on an array of servers for the last eight years.  I don't think I'd ever switch to anything ...

There will be times when you have you have your Postfix Mail Server set up and Spam is under control and all of a sudden you will see a new wave of Spam hit your site.  This article will help you see how you can make some small adjustments to cut down on new waves of Spam.  Here is an example of the new wave of Spam I started ...