SMTP Authentication prevents unauthorized user from sending out spam mails. But some applications do not support SMTP Authentication. Example of these are web applications with mail sending features (Microsoft Office Sharepoint Server, PHP based applications, etc).
(more…)These are the collection of Postfix howtos available on this site. Red bullets means a better solution exists and the information has been retained for reference only.
(more…)Postfix does not support mailbox quota. But thanks to Anderson Nadal’s Postfix Virtual Delivery Agent (VDA) patches, it can. To use the Postfix VDA requires two things, first Postfix must be built with the VDA patches and second, virtual user accounts must be used. You can get the Postfix RPM with VDA patches here.
(more…)Postfix uses the file /etc/aliases to map an alias email address to any number of real email addresses. This page will show you how to use this file to specify a mailing list address or a proxy address for use in Postfix.
(more…)Below are custom built Postfix RPM packages configured with enough options to support all the Postfix features described on this website. These packages are provided to save you time from building your own. The Postfix features enabled in these builds are LDAP, TLS, MySQL, SASL 2 and VDA.
(more…)SMTP Authentication (SMTP Auth) provides an access control mechanism that can be used to allow legitimate users to relay mail while denying relay service to unauthorized users, such as spammers.
(more…)Postgrey is a simple and powerful anti-spam tool for Postfix. It works by using a technique called Greylisting. Adding greylisting in Postfix will give your Postfix mail server a simple and effective first line of defense against spam, at a cost of a few minor delays for newly identified senders. To install Postgrey, we are going to use the precompiled binaries from Dag Wieers RPM packages for Red Hat, RHEL, CentOS and Fedora.
(more…)By default, Postfix listens on the SMTP port number 25. Some ISPs block this port number so you may wish to provide an alternate port number to listen to or change it altogether.
(more…)If your Postfix mail server has multiple IP addresses, it will use the same SMTP hostname greeting on every IP Address. This may cause a problem since some mail servers check the SMTP hostname banner to see if the hostname points to the same mail server. If not, any mail you send may be rejected or handled as spam. You can confirm if you have this problem by getting a DNS report on your domain name.
(more…)This guide will show you how to integrate Active Directory/LDAP into Postfix and Dovecot. In this page, you will learn how to enable Postfix to lookup email addresses in LDAP and how to enable Dovecot to authenticate to an LDAP server.
(more…)