Chapter 6 – RouteFinder Software
Multi-Tech Systems, Inc. RouteFinder RF850/860 User Guide (PN S000400E)
77
Proxy > SMTP Proxy > SMTP SPAM Filtering
2.
Asterisk (*): Stop all email from or to this domain.
Example: All email from or to the domain
abc.com
will be stopped.
*@abc.com
3.
Set ([…]): Stop all email from a set such as
@abc[0-9]*.com
.
Example: All email from or to the domains that include numbers in the first part of their
names such as
0, 234,
or
789023
will be stopped.
0.com
234.com
789023.com
4.
Question mark (?): Stop all email with a match zero or one occurrence of the preceding
character or set of characters.
Example: All email from or to the domains
abc.com
,
abc0.com
,
abc1.com
, …
abc9.com.
*abc[0-9]?.com
5.
Backslash (\): Literal expression of the following character (the following character is a
metacharacter): @\[[0-9]{1-3}\[0-9]{1-3}\[0-9]{1-3}\]
The first two characters after the @\ [ means take the literal value of the
[
character.
Example: Email addresses with IP addresses like
username@[1.1.1.1]
will not be allowed.
Note:
SPAM emails with percent-hack can be eliminated by adding *%* to
Bad Patterns
list.
Message Filtering
When
Message Filtering
is checked, the screen expands to display the following fields:
Filter Attachments
If you check this option, then the email message or body will be searched for the extensions
and expressions added here. Emails containing these file extensions in the attachments will be
filtered. The email will be quarantined so that the administrator can decide whether to forward or
delete the email.
Examples of extensions are
.bmp
,
.exe
,
.gif
.
Also, double extensions such as .
tar.gz
cannot be
used.
If you want to search for the expression as is in the email, then add it just as it is. If you want to
use the entry as a regular expression, then enclose the entry with these brackets: < >
The wild card ‘*’ cannot be used to filter all attachments.
Filter Based on Subject
Enter the mail subject header to be searched for the expressions added here. If there is a
match, that email will be considered as spam.
Example: If the subject
Free
is to be searched in the email, added the word
free
.
Filter Based on Message Expressions
The email message and body will be searched for the expressions added here. If the
expression "as is" is to be searched for in the email, add the words
as is
. If the entry is to be
used as a regular expression, the entry should be enclosed in < >.
Adaptive Message Filtering
If this option is enabled, then the mail message or body will be searched for auto-learned
expressions by the Adaptive Message Filtering function.
Click the
Help
button for this screen to read more about
Adaptive Message Filtering
.
Remote SMTP – Spam Quarantine
This screen displays when
Message Filtering
is checked.
Remote SMTP Spam Quarantine Status
Check the
Status
box to enable
Remote SMTP – SPAM Quarantining
, which will send all
SMTP SPAM emails to the configured email address entered into the
Email Address of
Spam Account
field.
Click the
Save
button.
Note:
If remote quarantine is enabled, then local quarantine no longer exists.
Email Address of SPAM Account
Enter the email address of the spam account. All SMTP spam quarantined emails will be
forwarded to this account. The address should be RFC compliant. This is a mandatory field if
you checked the Remote SMTP Spam Quarantine Status box.
