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Email Subject Lines Words that trigger Spam filters

The easiest way to get your emails a direct route to the SPAM folder are the words utilized in your subject line. SpamAssassin is an open-source spam blocking application who publishes their rules for identifying SPAM on their Wiki.

Here are the rules SpamAssassin utilizes with words in the subject line:

  • The subject line is blank (Thanks Alan!)
  • The subject contains the words alert, response, assistance, proposal, reply, warning, notification, greeting, matter, credited, owe, indebted, debt, obligation or reactivation… or misspellings of those words.
  • The subject line contains the month abbreviated (example: May)
  • The subject line contains the words cialis, levitra, soma, valium or xanax.
  • The subject line begins with “Re: new”
  • The subject line contains “a bigger”
  • The subject line contains “approves you” or “approved”
  • The subject line contains “at no cost”
  • The subject line contains “security measures”
  • The subject line contains “cheap”
  • The subject line contains “low rates”
  • The subject line contains the words “as seen”.
  • The subject line begins with a dollar sign ($) or spammy looking monetary reference.
  • The subject line contains the words “your bills”.
  • The subject line contains the words “your family”.
  • The subject line contains the words “no prescription” or “online pharmaceutical”.
  • The subject line starts with lose, “weight loss”, or talks about losing weight or pounds.
  • The subject line starts with buy or buying.
  • The subject says something bad about teens.
  • The subject line starts with “Do you dream”, “Do you have”, “Do you want”, “Do you love”, etc.
  • The subject line is ALL CAPITALS.
  • The subject line contains the first part of the email address (example: subject contains “Dave” and the email is addressed to dave@domain.com).
  • The subject line contains sexually-explicit content.
  • The subject line attempts to obfuscate or misspell words. (example: c1alis, x@nax)
  • The subject line contains an English or Japanese UCE code.
  • The subject line contains Korean unsolicited email tag.

In the event you didn’t know where the word SPAM came from, here you go:

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