Barracuda Networks 4 Instalační příručka stáhnout pdf (Strana 64)

64 Barracuda Spam Firewall Administrator’s Guide

The following table describes the filters on this page.

Attachment Type Filter

Attachment Filtering allows you to block and quarantine messages if they contain attachments with

certain file extensions.

The maximum attachment size allowed by you Barracuda Spam Firewall is 100 megabytes. If a

message exceeds this size, the Barracuda Spam Firewall rejects the message and the sending server

notifies the sender that their message did not go through. Contact Barracuda Networks technical

support to change this maximum.

All messages, including those from whitelisted senders, go through attachment filtering. This means

that if a sender on your whitelist sends a message containing an unallowed attachment type, that

message is either blocked or quarantined (depending on your settings).

The following table describes the parameters on this page. Click

Save Changes after making any

changes. You can enter multiple lines for each filter with each line containing a type of file extension.

Table 5.6:

Filter Description

Allowed Email Addresses Add the e-mail address for each recipient you want to include in the

whitelist.

Recipients added to this list will never have their incoming messages

scored for spam, but these messages still go through virus scanning

and attachment filters. Whitelisted recipients can have their incoming

messages blocked if the sender’s IP address, domain, or e-mail

address is blacklisted.

Click Add after adding each entry, followed by Save Changes.

Blocked Email Addresses Add the e-mail address for each recipient that you want to include in

your blacklist, and specify whether the recipient’s incoming message

should be blocked, quarantined or tagged.

A common reason to block a recipient‘s e-mail address is if that user is

no longer with your company and you want to keep their account active

on your mail server.

Recipients added to this list never receive messages unless an accept

filter has been set up for the sender’s IP address, domain, or e-mail

address.

Click Add after adding each entry, followed by Save Changes.

Note

If more than one person manages your Barracuda Spam Firewall, you may want to add an

explanation in the Comment field that describes why the specified domains are whitelisted or

blocked.

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Barracuda Networks 4 Instalační příručka Strana 64