15. A non-transitory machine-readable storage medium including instructions executable by one or more processors to determine a probability that an email message is spam, the non-transitory machine-readable storage medium comprising: instructions to receive an email message; instruction to identify one or more words and/or phrases of the email message that are likely being obfuscated; and instructions to determine a probability that the email message is spam in dependence on at least both of the following which particular one or more words and/or phrases are identified as likely being obfuscated, wherein identifying some particular words and/or phrases as likely being obfuscated increases the probability that the email message is spam more than identifying other particular words and/or phrases as likely being obfuscated, and which particular one or more obfuscation techniques are being used to obfuscate the one or more words and/or phrases that are identified as likely being obfuscated, wherein detecting use of some obfuscation techniques increases the probability that the email message is spam more than detecting use of other obfuscation techniques.
15. A non-transitory machine-readable storage medium including instructions executable by one or more processors to determine a probability that an email message is spam, the non-transitory machine-readable storage medium comprising: instructions to receive an email message; instruction to identify one or more words and/or phrases of the email message that are likely being obfuscated; and instructions to determine a probability that the email message is spam in dependence on at least both of the following which particular one or more words and/or phrases are identified as likely being obfuscated, wherein identifying some particular words and/or phrases as likely being obfuscated increases the probability that the email message is spam more than identifying other particular words and/or phrases as likely being obfuscated, and which particular one or more obfuscation techniques are being used to obfuscate the one or more words and/or phrases that are identified as likely being obfuscated, wherein detecting use of some obfuscation techniques increases the probability that the email message is spam more than detecting use of other obfuscation techniques. 16. The non-transitory machine-readable storage medium of claim 15 , wherein the instructions to determine a probability that the email message is spam also include instructions to determine the probability that the email message is spam also in dependence on a quantity of words and/or phrases identified as likely being obfuscated, wherein the higher the quantity of words and/or phrases of the email message identified as likely being obfuscated the higher the probability that the email message is spam.