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Performance Tuning. Purpose of Postfix performance tuning The hints and tips in this document help you improve the performance of Postfix systems that already work. If your Postfix system is unable to receive or deliver mail, then you need to solve those problems first, using the DEBUG_README document as guidance. For tuning external content filter performance, first read the respective information in the FILTER_README and SMTPD_PROXY_README documents. Then make sure to avoid latency in the content filter code. As much as possible avoid performing queries against external data sources with a high or highly variable delay. Topics on mail receiving performance: Topics on mail delivery performance: Other Postfix performance tuning topics: The following tools can be used to measure mail system performance under artificial loads. General mail receiving performance tips Read and understand the maildrop queue, incoming queue, and active queue discussions in the QSHAPE_README document.

Postfix version 2.1 and later: Postfix Dedicated Transport Howto. Synopsis The scenario for this postfix dedicated transport example is a need to reduce the MTA's SMTP client delivery concurrency to a specific host as said host,, is rejecting delivery of concurrent messages possibly due to UCE countermeasures. We only need to throttle delivery concurrency for this particular host and possibly other hosts in the future while maintaining the default concurrency limit for all other hosts that are relayed to. To utilize per-transport postfix configuration parameters for specific hosts a "dedicated transport" needs to be implemented as outlined below. Implementation Define additional smtp transport The postfix file is where the new "slow" dedicated transport will be defined. One specific change for this new dedicated transport is the "maxproc" field value has been set to 1 instead of the default: /etc/postfix/ Create transport map file /etc/postfix/transport slow: Build the transport map .db hash table with postmap.

SASL Howto. Warning People who go to the trouble of installing Postfix may have the expectation that Postfix is more secure than some other mailers. The Cyrus SASL library contains a lot of code. With this, Postfix becomes as secure as other mail systems that use the Cyrus SASL library. Dovecot provides an alternative that may be worth considering. How Postfix uses SASL authentication SMTP servers need to decide whether an SMTP client is authorized to send mail to remote destinations, or only to destinations that the server itself is responsible for. SMTP clients outside the SMTP server's network need a different way to get "same network" privileges. Postfix does not implement SASL itself, but instead uses existing implementations as building blocks. You can read more about the following topics: Configuring SASL authentication in the Postfix SMTP server As mentioned earlier, SASL is implemented separately from Postfix. Which SASL Implementations are supported?

Configuring Dovecot SASL % saslauthd -a pam. Configuration d'un serveur mail - Breizh-Entropy. De Breizh-Entropy. Installation du serveur postfix Lisez cette page entièrement pour une configuration complète, chaque section ajoute quelques lignes aux différents fichiers de configuration. configuration postfix Pour qu'une machine reçoive et accepte des mails, elle doit disposer d'un serveur SMTP. Nous allons utiliser le serveur postfix. # aptitude install postfix debconf va vous poser une série de question, afin de générer la configuration de postfix, située dans le fichier /etc/postfix/ Les points importants : home_mailbox : par défaut postfix enregistre les mails dans /var/mail/user au format mbox (tout les mails sont dans un seul fichier). cette option permet d'enregistrer les mails dans le home des utilisateurs. home_mailbox=Mailbox conserve le format mbox alors que home_maildir=Maildir/ enregistre les mails au format Maildir (un fichier par mail).

On démarre le serveur postfix : # /etc/init.d/postfix start # aptitude install heirloom-mailx on fait un test ! Le fichier Aliases. Authenticated SMTP. Relaying Before we dive into SMTP authentication I want you to understand what relaying actually means. When Postfix receives an email and needs to forward it to another server this is called relaying. Incoming email When someone on the internet sends an email to some other mail server will deliver the email using SMTP to your mail server. Postfix will determine that it's responsible for email addresses in the domain and accept the email. Outgoing email (without authentication) John is on the internet somewhere and wants to send an email to Why? Outgoing email (with authentication) So how does John send his email? Mynetworks In addition to using SMTP authentication you can tell Postfix to always relay email for certain IP addresses. Enabling SMTP authentication in Postfix Authenticated SMTP with Postfix has been a hassle in the past.

Smtpd_sasl_auth_enable enables SMTP authentication altogether. Red Hat Postfix HOWTO. Beyond Default. We will cover three styles of configuration in this section. First the home user. Then the corporate environment and then finally we'll dig into some ISP configurations. The home users environment could be very simple or very complex depending on the number of users on their system, whether they have a networked environment or a stand alone environment, and their type of connection and service provider. 9.1.1 The Stand Alone Configuration If your machine does not have a network card and is not connected to a Local Area Network (LAN) and you use your MTA to send mail to the net over a PPP connection, a cable modem, or a Digital Subscriber Line (DSL) connection then this section is for you.

Here is a sample “/etc/postfix/” configuration and some comments: The masquerade_domains line above is critical. Now if you know what you're looking at you'd know this is trouble just from seeing the subject line. Now you can see just how messed up the sender really is. 9.1.2 Fetching the mail. Configuration d'un serveur mail avec Postfix. Vous ne voulez plus confier vos mails à Gmail, Yahoo ou Hotmail ? Vous aimeriez héberger vos mails chez vous mais vous pensez que c'est trop dur, trop compliqué ? Vous pensez qu'il faut être ingénieur pour monter un serveur mail ? Que nenni !! Nous allons voir dans ce tuto la mise en place d'un serveur mail avec Postfix dans le cadre d'une utilisation personnelle. Il ne s'agit pas ici de concurrencer Gmail ou Yahoo mais bien d'avoir notre petite boîte mail bien à nous.

Ici, pas de gestion par base SQL ou annuaire LDAP, je vais tâcher de faire le plus simple possible. C'est parti !! [modifier] Une adresse mail, c'est un peu comme une adresse postale. Un domaine : un utilisateur : kevin Dans mon exemple, lorsque l'on écrit à Kevin via l'adresse, cela signifie que l'on écrit à l'utilisateur kevin du domaine [modifier] Identifier le serveur mail de, c'est le domaine. . … et son adresse IP est Serveur de Backup MX sous Postfix.

Le But de se billet est de vous apprendre à configurer un serveur mx secondaire avec Postfix. Plusieurs points sont à prendre en compte pour le bon fonctionnement, ils seront détaillés et expliqués afin de vous aider. La configuration Dns sert à indiquer le chemin à suivre pour le courrier. Dans cette exemple nous avons deux serveurs de mail, ceci est à configurer au niveau de votre fournisseur de DNS si vous ne gerez pas votre propre serveur avec bind9 par exmple. Configuration du DNS (bind9) : Rajouter ceci dans votre fichier zone de votre domaine : ;** ENREGISTREMENTS "MX" @ IN MX 10 @ IN MX 20 A faire pour chaques zones (domaines). Quand nous parlons de deux serveurs, le premier va servir à recevoir le courrier et le distribuer aux utilisateurs, quand au second il servira à stocker les mails en cas de panne ou d'indisponibilité temporaire du premier.

Un simple : aptitude install postfix ou yum install postfix devrait faire l'affaire. vi /etc/postfix/ PostfixBasicSetupHowto. This document will teach you how to set up a basic Postfix mail server with IMAP and POP3 services. It does not included advanced topics such as integrating virus-checking and spam-filtering, which are dealt with in PostfixVirtualMailBoxClamSmtpHowto and PostfixCompleteVirtualMailSystemHowto. In our setup, Postfix sends and receives mail from Internet and stores them in the user mailboxes while clients on the Internet can retrieve their mails via Courier IMAP or POP3. The user authentication is done by Courier Authdaemon. The following diagram shows this process. Components The following figure shows the main Postfix system components, and the main information flows between them. Yellow ellipsoids are mail programs.

Receiving Mail When a message enters the Postfix mail system, the first stop is the incoming queue. Mail is posted locally. In this setup I assume that your domain is and it has a valid MX record setup as Dig mx su - fmaster mail. Minimal Postfix SMTP Proxy. Current version: 0.2.0 [src] [srpm] [rpm] [rpm64] postprox is an SMTP proxy which copies an SMTP conversation between its input and another SMTP server, but spools the DATA portion to a temporary file and runs a specified program on it before passing it on to the output server - or outputting an SMTP error code instead if the content filter says so.

The design aim of postprox is to do only one job: proxy SMTP conversations and pass message contents to another program to determine whether to accept or reject the message. With this in mind, postprox is small and has a minimal feature set; its reduced complexity reduces the risk of bugs and security holes. Comments, bug reports, and patches gratefully received - please use the Contact Form. If you liked postprox, please consider a donation: [Donate] News (1 August 2011) generous donation received from JRS Systems - thank you!

0.2.0 - 24 January 2006 0.1.0 - 11 August 2005 0.0.1 - 5 August 2005 package created To Do Things still to do: PostfixCompleteVirtualMailSystemHowto. There are many howtos in the Internet about setting up mail servers and various people has various choice of MTAs. Some like, Qmail, while some like Postfix or Exim. I have been using Qmail for a long time and it is an excellent MTA. The way the Qmail is licensed and distributed that there are no binary packages so that users can easily setup with their favorite distribution, and installing basic Qmail setup even is not that difficult but users need applied various patches and tweaks etc to get a complete setup done. With all these issues Qmail is the preferred choice of many geeks, since it won't give you head ache once up and running.

The drawback is that this system is difficult to upgrade since users need to compile the source code and install. The decision behind this guide is to use Postfix, an equally secure and fast MTA like Qmail, it is easy to configure and setup a Basic System in any Linux distribution. It is important to know how our system works before going to install. Documentation de Postfix en français. Postfix. Translation(s): English - Italiano Postfix is a Secure Mail Transfer Agent. Installing and Configuring Postfix on Debian Install postfix (this will remove exim since there can't be two mail systems). (If you have a website, choose "Internet Site" if the configuration prompts ask for it.): apt-get install postfix Check the log mail.log, mail.err,, mail.warn to see if postfix runs. cat /var/log/mail.log Add your domain to the config files, so others can't abuse your mailsystem: postconf -e "myorigin =" Add your hostname (computer name).

Postconf -e "" Now add the domain names that your system will handle. postconf -e "relay_domains =,," Reload Postfix Server: postfix reload Test the mailserver. Telnet localhost 25 You should see: Trying Send an email to yourself: To end data hit enter, type in a dot, and hit enter again: Then quit You're done. You should be set. Anti-spam: smtp restrictions Forward Emails.