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November 2008

UPLOADMANAGER: Accueil

Partagez et Transférez vos fichiers de façon simple et sécuritaire Uploadmanager est une solution en ligne permettant l'échange de fichiers de tous types. Vidéos, images digitales, musiques, présentations, etc... * Votre mail ne part pas, où n'arrive pas, à cause d'un poids trop élevé ... * Vous devez faire appel à un coursier pour un fichier de 50Mb gravé sur CD ... * Vous êtes hors du bureau et vous n'avez aucun accès à vos données alors que la situation l'exigerait ... * La satisfaction de vos clients demande l'achat d'un serveur ftp, mais cette solution paraît coûteuse à l'acquisition comme pour sa maintenance et risque fort de saturer votre connexion internet ... * Vous voulez offrir à vos clients et partenaires un environnement propre et sécurisé Notre solution peut vous intéresser

getmail documentation (version 4)

getmail is a mail retriever designed to allow you to get your mail from one or more mail accounts on various mail servers to your local machine for reading with a minimum of fuss. getmail is designed to be secure, flexible, reliable, and easy-to-use. getmail is designed to replace other mail retrievers such as fetchmail. getmail version 4 includes the following features: * simple to install, configure, and use * retrieve virtually any mail o support for accessing mailboxes with the following protocols: POP3 POP3-over-SSL IMAP4 IMAP4-over-SSL SDPS (Demon UK's extensions to POP3) o support for single-user and domain mailboxes o retrieve mail from an unlimited number of mailboxes and servers o can remember which mail it has already retrieved, and can be set to only download new messages * support for message filtering, classification, and annotation by external programs like spam filters and anti-virus programs * support for delivering messages to different destinations based on the message recipient * reliability o native safe and reliable delivery support for maildirs and mboxrd files, in addition to delivery through arbitrary external message delivery agents (MDAs) o does not destroy information by rewriting mail headers o does not cause mail loops by doing SMTP injection, and therefore does not require that you run an MTA (like qmail or sendmail) on your host * written in Python, and therefore easy to extend or customize o a flexible, extensible architecture so that support for new mail access protocols, message filtering operations, or destination types can be easily added o cross-platform operation; getmail 4 should work on Unix/Linux, Macintosh, and other platforms. Windows support available under the free Cygwin package. * winner of various software awards, including DaveCentral's "Best of Linux"

October 2008

Howto: ISP-style Email Server with Debian-Etch and Postfix 2.3

(via)
The configuration described here is not very complicated but still needs to be done carefully. You are expected to have at least basic knowledge of: * MySQL (creating a database, granting access to users, basic SQL queries) * SMTP (what it is and what a basic SMTP dialog looks like) * POP3, IMAP (what they do and what the differences are) * basic Postfix configuration (understand the default settings in your main.cf, have read through the basic configuration document and know that your mail log file is at /var/log/mail.log) * Debian/Linux (general system administration, using a text editor, reading log files)

Drupal Postfix Integration Under Ubuntu 8.04 (Hardy) | HowtoForge - Linux Howtos and Tutorials

his document is derived from Christoph Haas’ tutorial “Howto: ISP-style Email Server with Debian-Etch and Postfix” (http://workaround.org) and Falko Timme’s tutorial “Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 8.04 LTS)” (http://www.howtoforge.com). The associated Mailfix Drupal module must be installed as part of this tutorial. It will guide you through the necessary steps to configure a Drupal driven Mail server. Provided features: * Drupal managed email accounts * Support for virtual domains * Automatic forwarding * Postfix quota support * Silent BCC monitoring * Other features: anti-spam, anti-virus

Dotdeb » Blog Archive » Calculate statistics from your Qmail logfiles using Awstats

Awstats is a commonly used program to calculate web statistics from your webserver logfiles. It can detect useragents, referers, unique visitors… But one of its another feature is to build usage reports from your mail server’s logfiles, as seen on this demo. Here is how to quickly configure Awstats to take profit of your Qmail log files…

LinuxMagic.com - Opensource/magicmail/magic-smtpd/magic-smtpd

MAGIC-SMTPD is a drop in replacement for Dan Bernsteins qmail-smtpd, and was originally designed to be part of the LinuxMagic Magic Mail Server. This OpenSource version has been released to allow others to benefit from it's anti-spam components, and valid user checking to reduce server loads and spam volumes. It is designed to support stock qmail installations, qmail/vpopmail installations, as well as having database support. Designed for ISP service, this will work for all mail servers large and small. Comments are welcome. Support for other mailers is expected in the future. Complete support packages are also available.

Tentakel to execute commands on multiple Linux or UNIX Servers

Many times, you want to execute a command not only on one server, but also on several servers. For example, find out * Version of kernel * Version of Apache web server * Update static html or images files on all web servers via rsync * Find out user information, server information, memory usage etc * Security/patch checking tentakel I have already covered how to execute commands on multiple Linux or UNIX servers via shell script. The disadvantage of script is commands do not run in parallel on all servers. However, several tools exist to automate this procedure in parallel. With the help of tool called tentakel, you run distributed command execution. It is a program for executing the same command on many hosts in parallel using ssh (it supports other methods too). Main advantage is you can create several sets of servers according requirements. For example webserver group, mail server group, home servers group etc. The command is executed in parallel on all servers in this group (time saving). By default, every result is printed to stdout (screen). The output format can be defined for each group.

September 2008

Mail Avenger

Mail Avenger is a highly-configurable, MTA-independent SMTP server daemon. It lets users run messages through filters like ClamAV and SpamAssassin during SMTP transactions, so the server can reject mail before assuming responsibility for its delivery. Other unique features include TCP SYN fingerprint and network route recording, verification of sender addresses through SMTP callbacks, SPF (sender policy framework) as a general policy language, qmail-style control over both SMTP-level behavior and local delivery of extension addresses, mail-bomb protection, integration with kernel firewalls, and more.

August 2008

smtp-delay plug-in for qmail

smtp-delay is an add-on/plug-in intended for use with qmail. It was written primarily to add banner delays and antipipelining to qmail. These two features are known to be able to block certain types of spam and virus mail sent through non-rfc-compliant SMTP engines. When I looked around for programs to add this functionality to qmail, I found only one such program, and didn't like the way it was done. BTW...I have the same objections to the way its done in sendmail 8.13.x. Since banner delays (the server pausing for some time before issuing an SMTP banner) cause every SMTP connection to take longer, I thought it would be a good idea to somehow exempt "legitimate" mail servers...or at least not subject them to long banner delays. So I decided to tune the banner delay time based on the connecting IP's reverse DNS. IPs with no rDNS get treated the worst (longest banner delay). IPs with rDNS matching a regex intended to detect dynamic/end-user IPs get a moderate delay. All other IPs get a very short banner delay...just long enough to see if they immediately pipeline (send SMTP commands before the banner's been sent). The original intent for smtp-delay was that it should be run before rblsmtpd, and simply set the RBLSMTPD environment variable if applicable, letting rblsmtpd issue the 4xx response. Pretty early on, I realized smtp-delay should be able to run standalone (without dependence on rblsmtpd to do its talking) and issue a 4xx response on its own. Lately, the spam load against our mail cluster has gotten so bad that I've started running smtp-delay after rblsmtpd, based on the idea that there's no point waiting out a long banner delay holding an open socket to an IP we have no intention of accepting mail from anyway. This reduced our concurrency by about 20%.

Throttling qmail SMTP receive bandwidth | www.enchantedage.com

I wrote the program "throttle.c," which you can insert into the tcpserver chain of commands for a qmail smtpd server. It takes one argument: the number of kilobytes per second to let through on the incoming file descriptor. Throttle does not throttle the outgoing file descriptor, because that's usually just status from your mail server. Additionally, throttle will set an alarm, so that any session longer than 15 minutes will expire and disconnect. This affords some amount of protection against lingering sessions that eat up your parallelism limit; I've seen such sessions from presumably trojaned DSL machines connecting to the mail server to send spam.

July 2008

Interazioni: chkuser 2.0

The original qmail-smtpd accepts by default all messages, checking later for the existence of recipients. So, if the message is delivered to not existing recipients, a lot of additional system work and network traffic are generated, with multiple expensive bouncing if the sender is a fake one. chkuser has been developed with the goal to improve the acceptance SMTP phase of qmail-smtpd. qmail-smtpd patched with chkuser may check the existence of e-mail recipients immediately in the SMTP acceptance phase of a message and rejects instantly all messages not directed to existing users, avoiding additional traffic, work and messages bounced more times.

June 2008

SMTP Performance Benchmarking

(via)
To test and benchmark several common SMTP servers for Unix. This is inspired by the work done by Matthias Andree at his Postfix vs. qmail - Performance page. His information, while likely still highly relevant is based heavily around file system I/O and not overall performance of the MTA. Additionally, more MTAs and OSs will eventually be tested here.

ImapSync: migrer un compte imap vers un autre

ImapSync est un script qui permet de copier de manière incrémentale et récursive un compte mail depuis un serveur vers un autre, à l’aide du protocole IMAP. L’intérêt de cet outil est qu’il ne copie que les mails qui n’existent pas encore sur le serveur de destination, rendant la migration beaucoup plus rapide qu’avec d’autres méthodes, en particulier si la migration s’interrompt en plein milieu: avec ImapSync, la migration continuera la où tu t’en étais arrêté. On notera que cet outil préserve de plus le statut de chaque message (lu, non lu, supprimé). Enfin, chaque message copié peut au choix être supprimé de la boite d’origine ou non. Autrement dit, cet outil peut être utilisé aussi bien pour synchroniser un compte mail avec un autre, que pour migrer un compte mail.

May 2008

April 2008

Z-Push - open source push technology

Mobile data synchronization is becoming increasingly important for many people, and various standards have arisen to perform this two-way copying 'over-the-air'. The most important platforms that can do wireless synchronisation are ActiveSync that is used to communicate with Exchange Server and Research-in-Motion's BlackBerry Enterprise Server (BES). Both solutions require proprietary server-side software from the vendor, therefore limiting the use of PIMs (personal information managers) to either wired synchronization or irritating 3rd-party synchronizers requiring the installation of client software on the PDA.

[Tutos] Administration de serveurs dédiés - Blog Alsacréations : XHTML, CSS et Standards web

by 4 others
Un ensemble de nouveaux tutoriels a été mis en ligne cette semaine pour inaugurer une nouvelle thématique : L'administration de serveurs dédiés. En effet, les hébergements dédiés sont devenus monnaie courante, et il est fréquent de devoir plonger les mains dans le cambouis. Ces tutoriels ont pour but de servir de feuille de route à la mise en place d'un serveur web sous Apache assorti de PHP et MySQL, ainsi que de services mail et ftp. Des conseils en matière de monitoring, de sauvegarde et de sécurité complètent le tour d'horizon. Deux d'entre eux abordent également de façon rapide l'installation du webmail Roundcube et du panel de gestion DTC pour contrôler plus efficacement les services évoqués précédemment dans le cas d'un hébergement multi-domaines.

Acheminement des e-mails

L'acheminement des e-mails permet aux administrateurs de spécifier les règles de distribution du courrier entrant. La mise à jour des paramètres DNS de votre domaine peut avoir un impact sur la distribution des messages des utilisateurs. C'est pourquoi l'acheminement des e-mails vous donne plus de flexibilité pour la distribution des messages adressés à votre domaine. Vous pouvez activer l'acheminement des e-mails sur l'ensemble de votre domaine ou seulement pour certains comptes d'utilisateurs.

March 2008

SSH dynamic port forwarding with SOCKS

SSH has numerous uses beyond just logging into a remote system. In particular, SSH allows you to forward ports from one machine to another, tunnelling traffic through the secure SSH connection. This provides a convenient means of accessing a service hosted behind a firewall, or one blocked by an outgoing firewall. However, forwarding an individual port still requires you to change where your program connects, telling it to use a non-standard port on localhost rather than the standard port on the remote machine, and it requires a separate port forward for each machine you want to access. Dynamic port forwarding via SOCKS provides a more convenient alternative. The examples in this article assume that you reside behind a restrictive firewall which does not allow outgoing SMTP connections except to a designated mail server. You want to connect to a different mail server, mail.example.net, on port 25. You have an SSH account on a machine shell.example.org, which does not reside within the restrictive firewall and can thus access port 25 on mail.example.net.

QMVC - Qmail Mail and Virus Control

is an unidirectional Mail Filter and Virus Scanner for Qmail. qmvc works in conjunction with the "dot-qmail" mechanism for qmail-local. It is entirely designed for Qmail and there are no additional patches required for Qmail.

February 2008

Artica for Postfix, a full Postfix Management console

by 1 other
You are not a Linux expert, Artica for Postfix allows you to install a full solution by one single command line: * Postfix: Main MTA * Kaspersky Anti-spam: powerfull Anti-spam provided by Kaspersky Inc * Kaspersky Anti-Virus * Bogofilter : Bayesian anti-spam * OpenLDAP: Database for main configuration and user management * emailrelay: little SMTP server (used as a content-filter) * SQLite library: zeroconf sql database engine with high perfomances. * Cyrus-imap: powerfull MDA System * Procmail: MDA Filter * Fetchmail: Email retreival * DnsMasq:DNS forwarder and DHCP server * Mailman:Mailing List manager * Sieve: End-user mail filters * Yorel script: Statistics of yorel * QueueGraph: Statistics for postfix * MailGraph: Statistics for postfix * AWSTats and geoip plugin: Statistics set for postfix * renattach: attachments filter

Spam Links - spam filter server addons

Filtering add-ons to specific mail server applications and instructions on how to filter spam with specific servers. Remember that spam filters are also available that work with any mail server on a particular operating system, and that some spam filters can be found that function on any operating system, with any mail server.

A frog around the world - Postfix - Installation d'un serveur mail secondaire

by 1 other
Ce billet explique rapidement comment installer un serveur mail secondaire ou appellé aussi MX (Mail eXchanger) secondaire, serveur de relai avec Postfix.

Greylisting: The Next Step in the Spam Control War

by 1 other
Greylisting is a new method of blocking significant amounts of spam at the mailserver level, but without resorting to heavyweight statistical analysis or other heuristical (and error-prone) approaches. Consequently, implementations are fairly lightweight, and may even decrease network traffic and processor load on your mailserver. Greylisting relies on the fact that most spam sources do not behave in the same way as "normal" mail systems. Although it is currently very effective by itself, it will perform best when it is used in conjunction with other forms of spam prevention. For a detailed description of the method, see the Whitepaper. The term Greylisting is meant to describe a general method of blocking spam based on the behavior of the sending server, rather than the content of the messages. Greylisting does not refer to any particular implementation of these methods. Consequently, there is no single Greylisting product. Instead, there are many products that incorporate some or all of the methods described here.

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