Barracuda Networks 4 Guia de Instalação descarregar pdf (Página 84)

84 Barracuda Spam Firewall Administrator’s Guide

Enforce RFC 821 Compliance Whether the Barracuda Spam Firewall requires that the SMTP "MAIL

FROM" and "RCPT TO" commands contain addresses that are

enclosed by ‘<‘ and ‘>’. It also requires that the SMTP "MAIL FROM"

and "RCPT TO" commands do not contain RFC 822 style phrases or

comments.

Setting this option to Yes stops messages sent from spam senders but

also from some Windows mail programs (such as Microsoft Outlook)

that do not adhere to the RFC 821 standard. For this reason, the

default setting is No.

Require Fully Qualified

Domain Names

Whether the Barracuda Spam Firewall requires fully qualified domain

names.

Reject Fake “From” domains Whether the Barracuda Spam Firewall rejects e-mail sent from

domains that do not have an entry in DNS.

Sender Spoof Protection

(inbound mode only)

Whether the Barracuda Spam Firewall prevents outside individuals

from sending e-mail using this domain as the “from” address. Setting

this option to Yes blocks all e-mail addressed from a domain for which

the Barracuda Spam Firewall receives e-mail.

You should only enable this option if all mail from your domains goes

directly to your mail server and not through the Barracuda Spam

Firewall.

SPF/Caller ID Configuration (inbound mode only)

Sender Policy Framework/

Microsoft SenderID

Framework:

SPF (Sender Policy Framework) and Microsoft SenderID Framework

are checks that can help the Barracuda Spam Firewall distinguish

between spam and legitimate messages.

Enabling this feature impacts the performance of the Barracuda Spam

Firewall due to the multiple DNS queries needed to retrieve a domain's

SPF or SenderID record (if it exists). Turning on this option causes

messages that fail this test to be blocked. The default setting for this

setting is No.

How SPF works

Domain owners identify the addresses of their sending mail servers in

DNS. When an SMTP receiver (like the Barracuda Spam Firewall) gets

a message, it checks the sending mail server address contained in the

message against the domain owner’s DNS records. If this check does

not find a record for the sending mail server, the message is assumed

to be spam.

Trusted Forwarder IP The Trusted Forwarder IP address is a list that contains the IP

addresses of any machines that you have set up to forward e-mail to

the Barracuda Spam Firewall from outside sources.

The Barracuda Spam Firewall ignores any IP address in this list when

performing SPF/SenderID checks. Instead, the next IP address in the

Received headers list is tried.

Incoming SMTP Timeout

Table 7.1:

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 141 142

Comentários a estes Manuais

Sem comentários

Barracuda Networks 4 Guia de Instalação Página 84

Comentários a estes Manuais

Manuais e produtos relacionados com Software Barracuda Networks 4