At the Mail Gateway, MailScan for SMTP Servers scans and cleans mails that flow between all local users and mails between the Internet and Mail Server. It protects organizations against Viruses, Worms, Trojans, Backdoors and many other malware, blocks Spam and Phishing mails, while providing total Content Security for email traffic.
Proactive Security at Mail Gateway-
MailScan 5 for SMTP Servers
MailScan 5 for SMTP Servers is the world's most advanced AntiVirus, Content Security and Mail Management Solution at the Mail Gateway, for Mail Servers working on different Operating Systems and platforms like Windows, Unix, Linux, Novell and Solaris. Installed on a Windows machine, it comes with an inbuilt, multi-threaded SMTP Server and a POP3 Downloader, and acts as a Security Gateway between your Mail Server and the Internet. At the Mail Gateway, MailScan for SMTP Servers scans and cleans mails that flow between all local users and mails between the Internet and Mail Server. It protects organizations against Viruses, Worms, Trojans, Backdoors and many other malware, blocks Spam and Phishing mails, while providing total Content Security for email traffic.
Page 1 / 11 Components of MailScan for SMTP Servers The diagram below explains the key MailScan components and their functions.
Fig1 - MailScan Process Flow
How Scanning is done in MailScan?
When an e-mail is received or sent, it goes through a series of processes given below. a) It is disassembled into the following components: 1. Header 2. Body 3. Attachments b) The Body and the attachments pass through Anti-Virus and Content Administrator components. The AntiVirus engine does a thorough check for Viruses and other malware and if
Page 2 / 11 malicious code is detected, it is cleaned immediately. If cleaning is not possible, the mail is deleted or quarantined. The Content Security component checks for violation of Security Policies. c) Depending on the results, the mail is either, 1. delivered to its destination 2. forwarded to the administrator 3. deleted 4. quarantined d) MailScan has a comprehensive SMTP receiver daemon. Termed as the SMTPD-SMTP Server, the daemon receives mails and saves them in a local directory for further processing.
SMTP Administrator Module
Fig 2 - SMTP Administrator
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Fig 3 - Web Interface for SMTP Admin Gateway Configuration You can configure inbound and outbound mails based on various parameters like users, domains and Ports. The option enables you to specify allowed domains, their IP address and the Port number. User and Mail Restrictions You can specify those e-mail IDs in your network that needs to be blocked from receiving or sending emails via the Internet. You can also set mail size restrictions and mail parking time. Mail Parking allows users to stop a mail from being delivered, if it's been sent by accident or in case the sender has a change of mind. It can also used to ensure that mails that are large in size are scheduled to be sent when the usage of Internet bandwidth is at the lowest. 'Restrictions from users' enables the admin to specify e-mail IDs or Host IP of users whose mails can be allowed or blocked in the SMTP Server. Sender ID Checking For Spam Detection
Page 4 / 11 MailScan performs its first level of Spam Control at the SMTP administrator level, based on internationally acknowledged lists of known spammers. Two such standards are RBL and DUL. Realtime Blackhole List (RBL) Organizations like MAPS (Mail Abuse Prevention System) provide a list of IP addresses of known Spammers, known as Realtime Blackhole List. When a suspicious client requests access to the SMTP server, you can send the IP address to the MAPS list, which returns the request after verifying the authenticity. Dial_Up Users List (DUL) Many spammers use a Dial-Up service to send Spam. IP addresses appearing in Dial_Up Users List are immediately blocked by MailScan. User based Rule Sets
User based Rule Sets allow you to send a copy of mails received from a user or domain to another e-mail ID or domain and specify the route or IP address to be used in sending the copy. Similar rules can be set for sent mails as well. Option is available to send an acknowledgment to users when mails are delivered or the SMTP Server fails to deliver the message. Authentication Using the authentication option, the Server can authenticate a client and permit the client to confirm if the SMTP Server is genuine or not. This will help the administrator cu... [download for more]
