Direct To Mx Exchange Spam

• Direct-to-MX is a mail-delivery technique used by spammers in which mail is sent directly from the spammer's computer to the recipient's mail exchange (MX) host, bypassing any intermediate mail transfer agents.
• An affiliate is a person who receives money or other considerations in exchange for using his internet resources to direct business to other firms.
• While catchall addresses are a well-intentioned feature (ensuring that any mail directed to a domain can be received and directed to someone in charge, even if the address is misspelled), they cause problems when mixed with spam and other forms of mail abuse.
• Today, email is normally sent directly from origin to destination.
• The vast majority of spams are sent via direct-to-mx, usually from open proxies.
• The direct-to-mx technique allows message origins to be disguised.
• Some spam is only informational and because there is no direct product for sale, the spammer does not need to leave a website address or phone number, and this makes it harder to track them down.
• Socks is a networking proxy protocol that enables hosts on one side of a SOCKS server to gain full access to hosts on the other side of the SOCKS server without requiring direct IP-reachability.
• Third, it can cause bounces and complaints to be directed to the innocent third party.
• As opposed to direct mailings, which can costs cents per letter, spam costs a fraction of a fraction of a cent per message.
• Probe messages are evidence of a dictionary attack (or "directory harvest attack" or "mx probe") in which the spammer sends probe messages to a large number of e-mail addresses (some of which may be guesses) and prunes out those that are rejected by the mx.

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