[Tips] Anti Spam Email Gateway (Firewall and Free Antivirus)

Its value is simplicity

 Built to meet common and applicable requirements, makes it ready within 30 minutes

• Designed for Linux & Windows administrators without advanced email security experience. Its goal is to be as simple as possible.

• An easy to use, already adjusted email gateway (firewall) offering free anti-spam, anti-virus protection in order to secure all existing email servers, such as Microsoft Exchange, Lotus Domino, Postfix, Exim, Qmail and more.

• Basic deployment in no time: In order to start using this application you need to cover only two steps, described in basic configuration.

• Built-in multilayer security levels make adjustment effort equal to a car radio.

• An independent and affordable email security solution with no migration requirements and no cost for implementation and post-maintenance.

• No limits: protect unlimited domain names and email servers under one roof.

• Combines simplicity with effective protection using powerful (mature, flexible and scalable) open source tools with additional set of rules & filters.
• Helps saving time and money in 70+ Countries with 1,200+ currently active installations protecting tens of thousands of domains in: United States • Germany • United Kingdom • Netherlands • Canada • Russia • Italy • Switzerland • France • Sweden • Indonesia • New Zealand • Poland • Denmark • Israel • Belgium • Bulgaria • Austria • Brazil • Turkey • India • Slovakia • Korea • Slovenia • Serbia • Hungary • Taiwan • China • Greece • Ireland • Argentina • Norway • Australia • Chile • Hong Kong • Spain • Philippines • Saudi Arabia • Latvia • Pakistan • Qatar • United Arab Emirates • Malaysia  • and others.

Most Features are automated:

• 256 bit TLS/SSL encryption with Perfect Forward Secrecy (for SMTP & HTTPS)
• Virus scanning for inbound and outbound emails
• Different Quarantine per domain
• Different Scores per domain for Tagging and Blocking SPAM
• Provides DMARC record: get notified when domain names are exploited.
• Additional SMTP ports
• Spam scanning for inbound and outbound emails originated from non-intranet server
• Powerful and innovative geographic filtering for Sender IP, Server IP, URL IP and TLDs.
• Verify Sender IP against weighted white/blacklist providers (score RBL).
• Spammer database pollution by deploying unlimited spam traps for your website
• Innovative, easy to use (drag & drop) spam feeder using IMAP clients (as Outlook)
• Various validations for hostname, domain, IP, helo/ehlo commands and more
• Verifies incoming emails for DKIM and signs outgoing emails (2048 bits RSA)
• Active Directory recipients validation
• Protection against fake messages that appear to come from your domain or from yourself
• Built-in rules for newsletters and other messages generated by automated systems
• Protection against executable files, malicious content, scripts and more
• Eliminates a large amount of junk emails sent by infected or hijacked computers.
• Various tests for embedded pictures.
• Protection against forged domains like (fake) yahoo.com, gmail.com etc.
• Protection against wifi, dynamic, invalid or unknown hosts.
• Easy to replicate messages across the world by typing a backup (sub)domain.
• Whitelist [sender domain] using drag & drop emails (with MS Outlook)
• Blacklist [sender address] using drag & drop emails (with MS Outlook)
• Reduce storage cost by redirecting multimedia messages (archived or hidden)
• Relay outgoing messages through a global or per sender domain ISP (smarthost)
• (Experimental) Lite DLP for MS Word, Excel, PowerPoint, PDF and scanned images (archived or hidden)
• Assign an outbound IP address per domain
• Disclaimer per domain
• Accelerate http traffic with web cache
• Simple web interface with guidelines
• Enforce encrypted connection with email servers
• Backup (BCC) incoming/outgoing emails to an alternative mailbox
• Clone/duplicate incoming emails to another (sub-)domain
• Custom Spam TAG in the Subject
• Fallback delivery on alternative email servers
• Prevent bounces
• Learn spam from other email servers
• Internal DNS cache

Available as 32bit and 64bit:

 - ISO image (Internet connection required during installation)

 - install from scratch (Internet connection required during installation).

Configuration

Minimum Requirements (for a testing platform):

512 MB - 1 GB of RAM

6 GB storage

1 Processor x86/AMD64

1 network adapter with 1 IP address

Internet connection during installation

VMware, VirtualBox or bare-metal

Requirements for 4,500 - 5,000 messages/day:

1 GB+ of RAM

30 GB storage

1 multicore Processor x86/AMD64

1 network adapter with 1 IP address

Internet connection during installation

VMware, VirtualBox, Hyper-V or bare-metal

Considerations for multiple domains:

High I/O storage drive (SSD or RAID5)
Different outgoing IP addresses per sender domain (separate reputation between senders).