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EFFICIENT SPAM AND VIRUS MAIL FILTER
To ensure efficient email communication and business continuity, IT professionals depend on reliable spam and virus blocking software. With Proxmox Mail Gateway you get the job done.
Proxmox Mail Gateway helps you protect your business against all email threats like spam, viruses, phishing and trojans at the moment they emerge. The flexible architecture combined with the userfriendly, web-based management make it simple for you to control all incoming and outgoing emails. You maintain a professional email workflow and gain high business reputation as well as customer satisfaction.
WHY PROXMOX ?
Proxmox Mail Gateway integrates two high performance and multithreaded anti virus engines to an affordable price:
- Avira (optional)
ClamAV is an open-source (GPL) antivirus engine designed for detecting trojans, viruses, malware and other malicious threats. It provides a high performance mutli-threaded scanning daemon, command line utilities for on demand file scanning, and an intelligent tool for automatic signature updates.
Avira SAV can be licensed additionally as another anti virus scanning option. Avira SAV is effective defense against malware, extremely reliable and with full multi-threading support. Note: End of sale for Avira SAV in August 2017.
Proxmox Mail Gateway uses a wide variety of local and network tests to identify spam signatures. This makes it harder for spammers to identify one aspect which they can craft their messages to work around. Every single e-mail will be analyzed and get a spam score assigned. The systems attempt to optimize the efficiency of the rules that are run in terms of minimizing the number of false positives and false negatives.
Many of the junk messages reaching your network are emails to non-existent useres. Proxmox Mail Gateway detects these emails on SMTP level, which means before they are transferred to your networks. This reduces the traffic to be analyzed for spam and viruses up to 90% and reduces the working load on your mail servers and scanners.
Sender Policy Framework (SPF) is an open standard for validating emails and to prevent sender IP address forgery. SPF allows the administrator of an Internet domain to specify which computers are authorized to send emails with a given domain by creating a specific SPF record in the Domain Name System (DNS).
A DNS-based Blackhole List (DNSBL) is a means by which an Internet site may publish a list of IP addresses, in a format which can be easily queried by computer programs on the internet. The technology is built on top of the Domain Name System. DNSBLs are used to publish lists of addresses linked to spamming.
Exclude senders from SMTP blocking. To prevent all SMTP checks (Greylisting, Receiver Verification, SPF and RBL) and accept all e-mails for the analysis in the filter rule system, you can add the following to this list: Domains (Sender/Receiver), Mail address (Sender/Receiver), Regular Expression (Sender/Receiver), IP address (Sender), IP network (Sender) .
Some particular words have a higher probability of occurring in spam emails rather than in legitimate emails. By beeing trained to recognize those words, the Bayesian checks every email and adjusts the probabilities of it beeing a spam word or not in its database. This is done automatically.
Black- and Whitelists are an access control mechanism to accept, block, or quarantine emails to recipients. This allows you to tune the rule-system by applying different objects like domains, email address, regular expression, IP Network, LDAP Group, and others.
Proxmox Mail Gateway gathers statistical information about spam emails. This information is used by an autolearning algorithm, so the system becomes smarter over time.
SURBLs are used to detect spam based on message body URIs (usually web sites). This makes them different from most other Real-time Blocklists, because SURBLs are not used to block spam senders. SURBLs allow you to block messages that have spam hosts which are mentioned in message bodies.
The innovative Proxmox Message Tracking Center tracks and summarizes all available logs. With the web-based and userfriendly management interface the IT admins can easily overview and controll all functions from a single screen.
The Message Tracking Center is very fast and powerful, tested on Proxmox Mail Gateway sites processing over a million emails per day. All different log files from the last 7 days can be queried and the results are summarized by an intelligent algorithm.
- Arrival of the email
- Proxmox filtering processing with results
- Internal queue to your email server
- Status of final delivery
The real-time syslog shows the last 100 lines, the output can be filtered by selecting the log files from a service or by entering an individual search string.
Greylisting an email from a sender your system does not recognize, means, that it will be temporarily rejected. Since temporary failures are built into the RFC specifications for mail delivery, a legitimate server will try to resend the email later on. This is an effective method because spammers do not queue and reattempt mail delivery as is normal for a regular Mail Transport Agent. Greylisting can reduce e-mail traffic up to 50%. A greylisted email never reaches your mail server and thus your mail server will not send useless “Non Delivery Reports” to spammers.
To provide a 100% secure email system for your business, we developed Proxmox High Availability (HA) Cluster. The Proxmox HA Cluster uses a unique application level clustering scheme, which provides extremely good performance. Fast set-up within minutes and a simple, intuitive management keep resource needs low. After temporary failures, nodes automatically reintegrate without any operator interaction.
The Proxmox HA Cluster consists of a master and several nodes (minimum of one node). All configuration is done on the master and then synchronized to all cluster nodes over a VPN tunnel.
- Centralized configuration management
- Fully redundant data storage
- High availability
- High performance
- Unique application level clustering scheme
- Cluster setup is done within minutes
- Nodes automatically reintegrate after temporary failures – without any operator interaction.
With MX records it is simple to set up a high performance load balanced mail cluster. You just have to define two MX records with the same priority.
To start, you need two working Proxmox Mail Gateways, each having its own IP address. Then you define your MX records. You will receive mails on both hosts – more or less load-balanced, using Round-robin scheduling. Round-robin (RR) is a scheduling algorithm for processes in an operating system. If one host fails the other is used.
Note: It is always very useful to add reverse lookup entries (PTR records) for those hosts. Many e-mail systems nowadays reject emails from hosts without valid PTR records.
If you have many domains, it is possible to use one MX record per domain and multiple address records. This way you can avoid using several DNS MX records, which sometimes can be very clumsy if you have many domains.
The object-oriented rule system enables custom rules for your domains. It’s an easy but very powerful way to define filter rules by user, domains, time frame, content type and resulting action. Proxmox Mail Gateway offers a lot of powerful objects to configure your own custom system.
- ACTIONS – object: Defines the final actions
- WHO – object: Who is the sender or receiver of the e-mail?
- WHAT – object: What is in the e-mail?
- WHEN – object: When is the e-mail received by Proxmox Mail Gateway?
Every rule has five categories FROM, TO, WHEN, WHAT and ACTION. Every of these categories can contain several objects and a direction (in, out and both).
For example, a virus protection looks like this:
Options range from simple spam and virus filter setups to sophisticated, highly customized configurations blocking certain types of e-mails and generating notifications.