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APOP – Authenticated POP – a way of sending the password to the incoming e-mail server in an encrypted way so that it cannot be retrieved by network sniffers. Only some POP3 servers support this feature. You can test it with the POP3 Test button.

ASMTP – Authenticated Simple Mail Transfer Protocol – A specification for sending user and password information to an SMTP server. See SMTP. The original SMTP did not allow for authentication.

Blacklists – Blacklists keep track of the IP addresses of known spam servers, and open relay machines that can assist spammers. Spam Sleuth can check with these servers to determine whether an e-mail was sent from a known spam server.

Charsets – E-mail programs can specify a non-standard character set which is usually used for Chinese and Korean e-mails. E-mails that use other character sets can show additional characters. Spam Sleuth allows you to add points for these characters and also for e-mails that specify different character sets.

Common Log Format - An industry standard log format as defined by the W3C.

ESMTP – Extensions to Simple Mail Transfer Protocol – A specification for additional features beyond SMTP. See SMTP. ESMTP servers can support additional login methods.

Extended Log Format - An industry standard log format as defined by the W3C working draft (WD-logfile)

IMAP4 – A protocol based on RFC 1730
that allows downloading messages as well and putting messages into folders on an e-mail server. Most ISPs use POP3 instead of IMAP4. Most servers that support IMAP4 also support POP3. Spam Sleuth uses POP3 and not IMAP4.

Polling Mode – The mode in Spam Sleuth which is the opposite of POP3 Proxy Mode. In Polling Mode, Spam Sleuth must check your e-mail before your e-mail program. Any non-spam messages will be left on your e-mail server, while spam messages will be removed and temporarily stored.

POP3 – Post Office Protocol 3 – A specification for an e-mail server to talk to an e-mail client. Based on RFC 1939
, POP3 specifies how an e-mail program like Eudora, or Outlook communicate with a server to get the e-mail.

POP3 Proxy Mode – The mode in Spam Sleuth which when activated in account configuration will cause Spam Sleuth to become your e-mail server. You must modify two settings in your e-mail program when using POP3 Proxy Mode. Change the Incoming (POP3) Server to localhost, and change the login/username to your full e-mail address.

Regular Expressions – A very powerful syntax for searching for complex patterns in texts such as e-mail messages. The syntax of the regular expressions used in Spam Sleuth can be found in Appendix A.

SMTP – Simple Mail Transfer Protocol – A specification for an e-mail client to send e-mail to a server, or for an e-mail server to send e-mail to an e-mail server. Based on RFC 821
, SMTP specifies how e-mail is sent.

Turing Test - Named after Alan Turing, it is method of determining whether the sender was a human or a machine. A test is given to the sender which is difficult for a machine, but trival for a human.

Tag Mode - Tag mode is an Enterprise only option which passes all e-mail through, but adds an "X-Text-Classification: spam" header to every spam message. This can be used by the e-mail clients to put the spam into a Junk/Spam folder.

VIP Key - An unlock code that you should have if you've purchased the program. It is usually e-mailed to you if you purchased online. It should also be on the CD or the Manual if you have the hard copy.