ESR series service routers.ESR-Series. User manual
•
•
•
•
•
•
•
•
•
13.9 Antispam service configuration
Mail antispam or spam filter is a program for detecting and filtering unwanted e-mail messages that can come
through corporate mail servers and public e-mail services (spam, mail phishing, etc.).
The main task of the Antispamservice is to detect such unwanted emails while they are still being delivered to
the recipient's mailbox. For this purpose, the ESR service router with configured Antispam service is installed in
the network in front of the protected mail server and redirects e-mail between this server and other mail
servers on the Internet through itself, actually performing the function of Mail Proxy.
Emails from external email domains will be analyzed in the Antispam service in the following ways:
authentication of the sending domain via SPF;
verification of the signature of an email signed with a domain key using DKIM technology;
identification of e-mails according to DMARC technology;
checking if there is a correct MX record for the domain from which the email is sent;
searching for the sender of an email in a list of known broadcast services;
searching for the sender of a letter in the RBL;
analysis of SMTP commands correctness during SMTP session pickup;
analysis of Unicode encodings present in the text of the letter;
analysis of references in the text of the email to phishing.
Emails that do not pass most of the checks will be discarded and will not reach the protected mail server.
13.9.1 Basic configuration algorithm
Step Description Command Keys
1 Configure router network name. esr(config)# hostname <NAME> <NAME> – up to 64 characters.
2 Assign domain name for the
router.
esr(config)# domain name
<NAME>
<NAME> – up to 255 characters.
3 Assign DNS server IP address
used for DNS names resolution.
esr(config)# domain name-
server <IP>
<IP> – in the format of
AAA.BBB.CCC.DDD, where each part
takes values from 0 to 255.
4 Enable DNS name resolution. esr(config)# domain lookup
enable
The function is activated only under the license.
1.
2.
When using the Antispam service to protect the mail server, make a number of additional settings not
directly related to the ESR router configuration.
Change the MX record for the domain in use so that it does not point to a protected mail server,
but to the ESR IP address with the Antispam service configured.
Configure the mail server to use SMTP Proxy, where the Proxy will be ESR with the Antispam
service configured.
To Next Page
Loading...
Need help?
General
