Do emails with no subject or fw: as a subject have a higher chance of ending up in a spam filter?


The likes of outlooks spam filter etc.

The reason Im asking is an invite was sent to twenty friends with no subject, and later forwarded to a few more with fw: on it.
Before saking it to be resent with a subject I thought Id ask am I right in my thinking?  If it makes no odds I was say nothing.

wordedAsked:
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kjanickeCommented:
Yes, it does.  Emails with the word "test" also end up scoring higher as spam.  We use IronPort and Barracuda, and process about 600,000 emails every hour.
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kjanickeCommented:
Here's an article that compares to our list.  It has some of the most used triggers for spam.

http://www.mequoda.com/articles/subject-line-spam-trigger-words/

FW in the subject doesn't quite score as high as blank subjects.  Blank subjects would play on the unsuspecting and people would open the email to see if it was worth reading.  Our Symantec virus protection for mail is also set to strip out blank subject lines.
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grbladesCommented:
In spamassassin (which a lot of isp's use) a blank subject line has a score of 1.76. Normally a score of 5 or 6 is required for a mail to be marked as spam.
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kjanickeCommented:
The problem with the scoring system is it isn't consistent amongst the vendors.  IronPort has a higher range which allows more flexibility when defining ranges.  My ISP does not use spamassassin, but they have set the rules to allow blank subject lines.  Many professional businesses do not allow blank lines becuase they have much more to lose if they are hit with a virus.  If an ISP passes an email with a virus, it's the home computer of the customer who needs extra protection.
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grbladesCommented:
Just a note that spamassassin uses scoring with two decimal places so there is plenty of range available if the threshold is 5.
Personally I use spamassassin and anything over a score of 20 is deleted and not even delivered to the spam folder.

Spamassassin is also used by the Barracuda product.
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kjanickeCommented:
Well, you have already confirmed the fact that blank subject lines score higher.  The score is based on a variety of attributes or elements, such as the domain or country the email came from.  Something else, may give it a score and your 1.76 just adds on top of that.

Is Deersoft or McAfee owned by Barracuda?  Which version of Spamassasin are you using?  We have a couple of Barracuda 1000 Models at each site.
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wordedAuthor Commented:
Thanks everyone
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