BlackList: zen.spamhaus.org
Status
: active
Weight value : 25
Number of mails checked
: 56
Number of matches in list
: 3
Number of failed checks (times disabled)
: 0
To clean out the dnsbl cache for my_smtp_alg and to reset all its statistical counters, the following
command option can be used:
gw-world:/> dnsbl my_smtp_alg -clean
Tip: DNSBL servers
A list of DNSBL servers can be found at:
http://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists.
6.2.6. The POP3 ALG
POP3 is a mail transfer protocol that differs from SMTP in that the transfer of mail is directly from a
server to a user's client software.
POP3 ALG Options
Key features of the POP3 ALG are:
Block clients from sending USER
and PASS command
Block connections between client and server that send the
username/password combination as clear text which can be
easily read (some servers may not support other methods than
this).
Hide User
This option prevents the POP3 server from revealing that a
username does not exist. This prevents users from trying
different usernames until they find a valid one.
Allow Unknown Commands
Non-standard POP3 commands not recognized by the ALG
can be allowed or disallowed.
Fail Mode
When content scanning find bad file integrity then the file can
be allowed or disallowed.
Verify MIME type
The content of an attached file can be checked to see if it
agrees with its stated filetype. A list of all filetypes that are
verified in this way can be found in Appendix C, Verified
MIME filetypes. This same option is also available in the
HTTP ALG and a fuller description of how it works can be
found in Section 6.2.2, “The HTTP ALG”.
Block/Allow filetype
Filetypes from a predefined list can optionally be blocked or
allowed as mail attachments and new filetypes can be added
to the list. This same option is also available in the HTTP
ALG and a fuller description of how it works can be found in
Section 6.2.2, “The HTTP ALG”.
Anti-Virus Scanning
The NetDefendOS Anti-Virus subsystem can optionally scan
email attachments searching for malicious code. Suspect files
6.2.6. The POP3 ALG
Chapter 6. Security Mechanisms
268
Содержание DFL-1600 - Security Appliance
Страница 27: ...1 3 NetDefendOS State Engine Packet Flow Chapter 1 NetDefendOS Overview 27 ...
Страница 79: ...2 7 3 Restore to Factory Defaults Chapter 2 Management and Maintenance 79 ...
Страница 146: ...3 9 DNS Chapter 3 Fundamentals 146 ...
Страница 227: ...4 7 5 Advanced Settings for Transparent Mode Chapter 4 Routing 227 ...
Страница 241: ...5 4 IP Pools Chapter 5 DHCP Services 241 ...
Страница 339: ...6 7 Blacklisting Hosts and Networks Chapter 6 Security Mechanisms 339 ...
Страница 360: ...7 4 7 SAT and FwdFast Rules Chapter 7 Address Translation 360 ...
Страница 382: ...8 3 Customizing HTML Pages Chapter 8 User Authentication 382 ...
Страница 386: ... The TLS ALG 9 1 5 The TLS Alternative for VPN Chapter 9 VPN 386 ...
Страница 439: ...Figure 9 3 PPTP Client Usage 9 5 4 PPTP L2TP Clients Chapter 9 VPN 439 ...
Страница 450: ...9 7 6 Specific Symptoms Chapter 9 VPN 450 ...
Страница 488: ...10 4 6 Setting Up SLB_SAT Rules Chapter 10 Traffic Management 488 ...
Страница 503: ...11 6 HA Advanced Settings Chapter 11 High Availability 503 ...
Страница 510: ...12 3 5 Limitations Chapter 12 ZoneDefense 510 ...
Страница 533: ...13 9 Miscellaneous Settings Chapter 13 Advanced Settings 533 ...