D-Link DFL-260E User Manual for DFL-260E - Page 289
The POP3 ALG, POP3 ALG Options
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6.2.6. The POP3 ALG Chapter 6. Security Mechanisms asdf.egrhb.net active 5 0 0 0 To examine the statistics for a particular DNSBL server, the following command can be used. gw-world:/> dnsbl smtp_test zen.spamhaus.org -show BlackList: zen.spamhaus.org Status : active Weight value : 25 Number of mails checked Number of matches in list Number of failed checks (times disabled) : 56 :3 :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 289