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den 8 september 2010 ..:: Support » Omnigate steps for e-mail security ::..   Login

 

 

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Omnigate SMTP Server
Below are the controls and security steps preformed in the Omnigate SMTP server. These controls can be activated or deactivated acording to the company e-mail policy.

1. Authentication and relaying
Authentication provides an access control mechanism. It can be used to allow legitimate users to relay mail while denying relay service to unauthorized users.
 
[a. Whitelisted]
Omnigate administrator can aprove certain domains, ip-adresser or e-mailadresses to pass thru Omnigate SMTP server without being controlled or blocked.
 
2. Domain valideting

All incomming e-mail validats that it is from a legitim and existing ip-adress and domain. Non existing adresses will be blocked.

 
3. RBL Controll
RBL, Realtime Black List, (or DNSBL, Domain Name System Black List) is a live service to protect your system from known spammers and open relays that potentially may be used by spammers.
  
 
4. User blacklisting
There are multiple options to blacklist incoming messages. Omnigate adminstrator may blacklist
on the senders domain and on the ip address that is sending the message. He may also blacklist on the name sent by the HELO command.
 
5. Graylisting
Greylisting is a effective method of defending e-mail users against spam.  In short, Omnigate will temporarily reject any email from a sender it does not recognize. If the email is legitimate, the originating server will try again to send it later, at which time Omnigate will accept it.  If the email is from a spammer, it will probably not be retried as most spam are comming from "hijacked" computers and not from e-mailservers.
    
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Omnigate Filter Engine
Below are the controls and security steps preformed in the Omnigate Filter Engine. These controls can be activated or deactivated acording to the company e-mail policy.

[b. Greenlist]
Omnigate administrator can aprove certain domains, ip-adresser or e-mailadresses to pass thru Omnigate filter engine without being controlled or blocked. Greenlisted messages passes directly to the virusscan module.  
 
6. User filters and rules
Omnigate filters make it easy to create specific rules for what is permitted for the company to receive, such as senders, e-mail content and attached files.
 
Omnigate can carry out the following measures when a rule is activated:
– Remove the message
– Send the message to a different email address
– Answer the message
– Save the message
 
7. Attachment controll
Block potential harmful attachments before they reach the end user. An attachment checking rule allows you to block attachments of a certain type.
Its wise to block all executable attachments, in Omnigate 7 its easy to do that.
 
8. RegEx Filter
A regular expression is a text pattern consisting of a combination of alphanumeric characters and special characters known as metacharacters. A close relative is in fact the wildcard expression which are often used in file management. The pattern is used to match against text strings. The result of a match is either successful or not, however when a match is successful not all of the pattern must match.
 
Regular expressions work with all e-mail communication protcolls: UUCP, POP3, Dial-up SMTP and SMTP.
 
 
[c. Quarantine folder]
All messages filtered by the Omnigate will be automatically placed in a Quarantine folder.
Users will receive a daily Quarantine report and may choose to delete or release a message.
 
Viruscanning

9. Viruscanning
Omnigate protects the company against computer viruses before they reach the user. The search for viruses is at the gateway level. Both in and outgoing emails are checked through for viruses. Multiple viruscanners can be used.

    
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