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advisable to observe the server s performance for some time to determine whether the change resulted in noticeable performance degradation To disable SMTP tarpitting on a Receive connector, set this value to 00:00:00 Curious to see SMTP tarpitting in action It s easy to figure out what the sender may experience simply telnet to the server s SMTP port and send a message to a nonexistent sender
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As discussed earlier in this chapter, when the original standards that define SMTP behavior were written, spam was not foreseen as a major concern As such, the protocol makes it quite easy to indulge in fraudulent behavior such as impersonating another sender or domain by providing a wrong address in message headers Because Internet e-mail is exchanged with unknown or anonymous sending hosts that are not authenticated, spammers use the ability to provide nonexistent or incorrect addresses to avoid detection The technique if it can be called that is known as spoofing Besides spam which may otherwise be harmless spoofing is also used by phishing messages Given that receiving Internet mail involves providing anonymous Internet hosts the ability to send mail without authentication, how can we make it easy to recognize practices such as spoofing By using the same protocol that is used to direct inbound mail to your mail servers namely DNS Just as MX records are used to direct inbound e-mail for a domain to designated mail servers in an organization, we can use a DNS record to state which mail servers are designated mail senders for the domain The idea is largely credited to Paul Vixie, the brain behind Berkeley Internet Name Domain (BIND) Meng Wong wrote the specs for Sender Policy Framework (or SPF), now frequently referred to as SPF classic Because no well-known resource record types existed in DNS to specify such information, it was and continues to be published in a text (TXT) record, commonly referred to as an SPF record SenderID is a combination of Wong s SPF classic and Microsoft s CallerID technology SPF classic looks at a single field in SMTP message headers the return-path field
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Phishing is a term used to describe the act of masquerading as well-known or trustworthy organizations, such as banks, other financial institutions, government agencies, and the like, to collect sensitive information such as social security numbers, credit card and bank account numbers, usernames, and passwords Needless to say, such information is used for identity theft, fraudulent use of credit cards, and other such activities E-mail messages are designed to appear as if they originated from the well-known organization, quite possibly one the recipient may recognize or have a customer relationship with, complete with logos, trademark information, and disclaimers in fine print The recipient is asked to click a link that may appear to be an Internet address (URL) belonging to the well-known organization, and this link redirects the recipient to a web page that s nearly identical to the organization being impersonated Given that such messages are very cleverly spoofed, and use very official-sounding language and layouts including logos and other visual elements of known organizations many recipients inadvertently end up providing valuable personal information
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Microsoft s SenderID uses an algorithm to extract what it calls Purported Responsible Address (PRA) from message headers This is done by examining the From, Sender, and Resent-From headers in a message Note that not all of these headers exist in all messages Once the original or purported responsible sender is determined, it is fairly easy to perform a DNS lookup query on the sending domain or rather what is claimed to be the sending domain and determine the hosts designated by it to send mail on its behalf If the sending host is not designated by the domain, the message can either be rejected or forwarded to the Content Filter agent, which can then inspect such messages with a higher degree of suspicion Specifying internal SMTP servers As discussed previously in the Connection Filtering section, Exchange servers that are targets of MX records and receive Internet e-mail directly can determine the sending host s IP address easily it is the same host that connects to your Exchange server and establishes an SMTP session Exchange servers that are not Internet-facing (or otherwise receive inbound e-mail from a non-Exchange SMTP gateway or relay host) can determine who the external sending host is by examining the Received headers in a message The list of internal SMTP servers needs to be populated with all the SMTP servers, including non-Exchange gateways and anti-spam appliances that handle inbound Internet mail Enabling SenderID Filtering SenderID Filtering is enabled by default on Edge Transport servers and on Hub Transport servers with anti-spam agents installed The default action is set to stamp the SenderID status on the message and continue processing the message No messages are rejected if SenderID lookups fail The other options are to delete messages silently, without returning an NDR, and to reject messages during the SMTP session
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