MailScan 4 for SMTP Servers is for customers using Linux, Unix, Novell or other non-Windows platforms on their e-mail Server. MailScan for SMTP Servers works on a Windows machine and acts like a Security Gateway between your Mail Server and the Internet. It also has an inbuilt multi-threaded SMTP Server and a POP3 Downloader.

It has the world's first e-mail, Content-Security and Anti-Virus feature that analyzes e-mail's on a real-time basis, before they are delivered to the clients or the servers on your network. This version, allows you to scan internal mails (local user to local user) and external mails (local user to Internet, Internet to local user).

Besides providing Anti-Virus and Content-Scanning, MailScan also has a Generic Attachment Analyzer, automatic compression / decompression feature, a comprehensive Notification Engine and many other features.

Features specific to MailScan 4 for SMTP Servers

• Realtime Blackhole list (RBL): MAPS (Mail Abuse Prevention System) provides a list of IP addresses that are known Spammers or allow spamming. This list is called as Black hole list. When your SMTP Server, receives a mail from a domain, not on its allow domain list, you can send a query to MAPS Server which verifies the IP.
• Dial-Up Users (DUL): Spammers sometimes use stealth mail tactics when their initial Spam attempts are blocked. They use a dial-up-service (DUL) provider to connect their Spam mail service, to the SMTP Server. This is trespassing on your MailServer and the MAPS DUL project helps in identifying and stopping Spam. The project has a list of DUL users who are known Spammers. To verify if the request for connection to your SMTP Server is genuine, you can send a query to dialups.mail-abuse.org. The request is verified and returned.
• Reverse DNS: MailScan for SMTP server will do reverse DNS for each connecting IP to verify their IP when other users try to connect to your server.
• User level routing/forwarding: It provides routing and forwarding of mails on user level
• Mailparking and Mail delay: This feature provides Delay for Outbound Mails It also allows you to select the size of e-mails that should be parked or delayed and set the time duration.
• Mail size Restriction: It provides Mail size restriction on gateway level.
• Clustering: This feature is useful to ISP or Servers that receive a large number of mails that need to be scanned. The primary server receives mails. Scanning takes time and you can designate other machines in your network, distribute mails to them for scanning. This is called load balancing and the machines form a Cluster. The cluster machines need not be connected to the Internet but they must have MailScan for SMTP Server installed.
  
• It provides Relay Control using IP-blocks (to ensure that unauthorized IP addresses are blocked from sending mails through the Mail Server).
• It also provides Relay Control using Sender-Domain Checks. E-mails sent through MailScan for SMTP Servers are checked for validity of domain names, before they are accepted for for delivery.
• MailScan for SMTP Servers can control multiple domains.
  
• MailScan provides Hop Control to ensure that the mails do not loop.
• SMTP: ETRN Support added - Extended Turn feature added In Mailscan for SMTP server. ETRN is an extension to the SMTP mail delivery protocol that allows an SMTP server to request from another SMTP server any e-mail messages it has for a specific domain. ETRN typically is used to retrieve e-mail messages from a mail server that does not have a dedicated connection to the Internet. ETRN can only be used in conjunction with an ISP that supports ETRN. This feature is available only for MailScan for SMTP Server.

• POP-Downloader can download mails from multiple POP3 accounts and forward them to the SMTP Server for delivery.
  
• Size restriction can be applied on mails that are downloaded.
• Wildcard Account download is supported. A single account collects mails for the entire domain. After download, recipients' addresses are checked for the domain, the mails sorted and sent to them.
• Duplicate mails are checked and not downloaded. These are deleted in the server itself.
  
• Smallest message is downloaded first and largest later.
• Configurable to schedule download of mails at regular intervals without any user intrvention.

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