PermaLink Postini / Google Messaging Security, X-pstn-levels Header Information07/18/2008 09:55 PM


Here is the information on the Postini X-pstn-levels Header Information.
The Postini Junk mail filter now called 'Google Messaging Security (GMS)'

Note:
I did the implementation for 2 clients one with 13.000 and one with 3000, IBM Lotus Notes Clients, with 100% satisfaction!

X-pstn-levels Header:
The letter/number pairs that appear on X-pstn-levels tell you which filters (if any) were triggered and to what degree.
The letters that may appear on this line are:

General Transport Heuristics Filters:
GT1 = General transport heuristics most trusted
GT2 = General transport heuristics more trusted
GT3 = General transport heuristics trusted

Spam Filters:
S = General/bulk spam score
CV = Internal use only. This has no effect on the overall spam score or message disposition.
P = Sexually explicit (pornography) spam score
M = Make-money-fast (MMF) spam score  
C = Commercial or “special offer” spam score
R = Racially insensitive spam score

Industry Heuristics Filters (optional feature):
FC = Financial Content score
LC = Legal Content score

Spam Scores:
A spam score of 100 on the S filter would indicate that this email contains nothing that triggers the general spam filter (it is a valid message).
The lower the score, the more likely that this message is spam.

Category Scores:
A message is assigned to a filter category when its score in that category is an 85 or below.

Example:
X-pstn-levels: (S: 0.00000/60.95723 CV:99.9000 R:95.91080 P:95.91081 M:64.93900 C:93.23770 )
X-pstn-settings:  5 (2.00000:8.00000) r p M c

The overall spam score is S: 0.00000. This is a Make-Money-Fast (M) spam message, as shown by the capital M in the X-pstn-settings line.
A score of 85 or below triggers a category filter and in this example the Make-Money-Fast score is M:64.9390.

The X-pstn-levels header will not be listed in the headers if one of the recipients has Bulk Email protection disabled.
This means that if the email message is sent to two users, one with the Bulk Email filter turned on and the other with it turned off, the message security service will not include this header.

Blatant Spam Blocking (BSB) Score:
A second numeric evaluation, the BSB score, appears after the spam score on the X-pstn-levels header. The BSB score is used by the spam engine to identify messages that should be bounced or blackholed by Blatant Spam Blocking. Unlike the spam score, the BSB score should not be evaluated directly.

Example:
X-pstn-levels:     (S: 0.00010/62.95723 )The spam score (S:) is separated from the BSB score by a slash (“/”).
The BSB score will always appear, even if BSB is not turned on.

Should a message score as blatant spam, the BSB disposition of bounce or blackhole will result in a discarded message being discarded. So, there will not be any headers for those messages. The reason the BSB score was added is to make it clear to someone evaluating the headers that the message did meet the spam score criterion but failed to meet the BSB score criterion.

See this link on the About Header Tags

Note:
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