Here are some key features of "GFI MailEssentials for Exchange/SMTP":

SpamRazer: An Additional Anti-spam Engine:
· SpamRazer provides a second layer of protection. It has been designed for ease-of-use and, due to frequent updates, SpamRazer needs no tweaking to be fully effective in filtering the latest spam attacks. Not only will administrators benefit from out-of-the-box filtering but they will also gain protection from each new attack without the need to tweak GFI MailEssentials. With SpamRazer filtering, greylisting, IP reputation filtering, Bayesian filtering and other advanced anti-spam technologies, our spam capture rate is well over 99%. GFI MailEssentials also has a market-leading low rate of false positives ensuring the safe delivery of important emails.

Greylisting:
· Greylisting is an anti-spam technique used to identify spam emails originating from non-RFC compliant mail servers (which are often utilized by spammers). For each new SMTP transmission, GFI MailEssentials records the sender, recipient and sending mail server’s IP address (aka triplet) and rejects any emails with a temporary failure message. Compliant email servers try and resend the message after a few minutes – this causes their triplet to be confirmed and connections with the same triplet are no longer rejected. Non-compliant mail servers do not try to resend the message.

Spam Quarantining:
· The administrator can select to quarantine spam emails. Spam emails are stored in a database and are automatically deleted after a pre-defined period of time. The administrator can also select to send a spam digest with information on quarantined emails. From the spam digest, users can review their spam emails, and approve them as required. The administrator is allowed full access to the quarantined emails.

Precise Real-time Dashboard:
· GFI MailEssentials also ships with a precise, real-time dashboard that gives administrators a graphic view of the software’s status as well as the server’s email flow. Components shown on the dashboard are: the status of key services provided by GFI MailEssentials; statistics of email flow; blocked spam; and also POP2Exchange logging and results can be filtered by sender, recipient, subject, etc.

Auto-log rotation:
· Administrators can select to log occurrences (such as blocked or whitelisted mail) and configure to start a new log file after a pre-defined period of time or at a specific size.

Spam Digest:
· Administrators can now send a daily report to the users that shows how many emails he or she received and how many emails, identified as spam, were filtered. A snapshot of email traffic will show the end-user how much spam email was successfully captured. The report gives a full list of those emails identified and filtered.

Eliminate Hard-to-Catch Spam:
· With spammers controlling tens of thousands of zombie machines, these large botnet armies have become one of the leading sources of spam. The Botnet/Zombie check, in GFI MailEssentials, eliminates hard to catch attachment spam such as image spam, PDF spam, Excel and ZIP spam. The attachment spam check filters this attachment spam quickly, efficiently and with a very low rate of false-positives. GFI MailEssentials uses two anti-spam filter engines and a variety of technologies such as greylisting and IP reputation filtering.

Requirements:

· Minimum: Intel Pentium or compatible 1 GHz 32-bit processor
· Minimum: 1GB
· Minimum HDD: 500MB for installation, 2GB for execution.
· Microsoft .NET Framework 2.0
· Microsoft Message Queuing Services
· Microsoft XML core services
· Microsoft Virtual Server cluster group resource with a physical disc cluster. This is required only for environments running Microsoft Exchange 2003 clusters
· MDAC 2.8 (included by default on Windows 2003 or later)
· IIS SMTP service (except for Microsoft Exchange 2007/2010 environments)
· IIS 6 or 7 WWW service when using Quarantine or Archive Web Interface
· Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 when installing on Microsoft Exchange 2007 or 2010