ZyXEL Communications ZyWall ATP series User Manual page 560

Table 224 Configuration > Security Service > Email Security
LABEL DESCRIPTION
DNSBL Domain This is the name of a domain that maintains DNSBL servers. Enter the domain that is
maintaining a DNSBL.
Actions for Spam Use this section to set how the Zyxel Device is to handle spam mail.
Mail
SMTP Select how the Zyxel Device is to handle spam SMTP mail.
Select drop to discard spam SMTP mail.
Select forward to allow spam SMTP mail to go through.
Select forward with tag to add a spam tag to an SMTP spam mail's mail subject and send it
on to the destination.
POP3 Select how the Zyxel Device is to handle spam POP3 mail.
Select forward to allow spam POP3 mail to go through.
Select forward with tag to add a spam tag to an POP3 spam mail's mail subject and send it
on to the destination.
Log Select whether to have the ZyXEL device generate a log (log), log and alert (log alert) or
neither (no) by default when traffic matches a signature in this category.
Action taken when An email session is when an email client and email server (or two email servers) connect
mail sessions through the Zyxel Device. Select how to handle concurrent email sessions that exceed the
threshold is maximum number of concurrent email sessions that the email security feature can handle.
See the chapter of product specifications for the threshold.
reached
Select Forward Session to have the Zyxel Device allow the excess email sessions without any
spam filtering.
Select Drop Session to have the Zyxel Device drop mail connections to stop the excess email
sessions. The email client or server will have to re-attempt to send or receive email later when
the number of email sessions is under the threshold.
Query Timeout Settings
SMTP Select how the Zyxel Device is to handle SMTP mail query timeout.
Select drop to discard SMTP mail.
Select forward to allow SMTP mail to go through.
Select forward with tag to add a tag to an SMTP query timeout mail's mail subject and send it
on to the destination.
POP3 Select how the Zyxel Device is to handle POP3 mail query timeout.
Select forward to allow POP3 mail to go through.
Select forward with tag to add a tag to an POP3 query timeout mail's mail subject and send it
on to the destination.
Timeout Value Set how long the Zyxel Device waits for a reply from the mail scan server. If there is no reply
before this time period expires, the Zyxel Device takes the action defined in the relevant
Actions when Query Timeout field.
Timeout Tag Enter a message or label (up to 15 ASCII characters) to add to the mail subject of emails that
the Zyxel Device forwards if queries to the mail scan servers time out.
Timeout X-Header Specify the name and value for the X-Header to be added when queries to the mail scan
servers time out.
Max. IPs Checking Set the maximum number of sender and relay server IP addresses in the mail header to check
Per Mail against the DNSBL domain servers.
Chapter 32 Email Security
ZyWALL ATP Series User's Guide
560