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Old 22 Jan 2019, 01:09 AM   #16
paleolith
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Join Date: Mar 2002
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Posts: 536
I had not checked in a few days. Just now found a false positive from Jan 16.

I have reopened my ticket, and also created a filter to save all emails with the ME_VADESPAM tag for review. If I get too many, I'll have to add a score cutoff.

Edward
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Old 23 Jan 2019, 08:25 PM   #17
paleolith
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Location: Florida
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Reply from Yassar Ali a few minutes ago:
This issue has been mitigated now. So the emails should no longer be filtered as spam.

However, we are continuing to work with our spam filtering service to avoid false positives like these.
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Old 24 Jan 2019, 06:53 AM   #18
Lesslame
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Join Date: Aug 2007
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I received the same answer to my ticket today.
Still surprising to see that one single "spam-factor" has such an enormous weight (5 points!) on the total spam score - especially as this factor is obviously far from working perfectly!
Cheers,
lesslame
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Old 29 Jan 2019, 11:39 AM   #19
paleolith
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Two more, sent Jan 24, only a day after Yassar told me it's fixed. Both emails were from AffordableRxMeds.com, a reputable Canadian dealer.

Edward
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Old 30 Jan 2019, 06:54 AM   #20
xyzzy
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I'm getting a little concerned about this ME_VADESPAM 5 thing too. I raised my spam threshold to 6.2 because of it and still got a false positive with a score of 7.2 because of it. I'm cutting of at 9.1 but I am beginning to wonder if I should raise that too.
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Old 30 Jan 2019, 08:40 AM   #21
elvey
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Speaking of headers ...

Speaking of headers - what are these for?

X-ME-VSCause: [A long, interesting string - all lower case letters; matches [cdefghijklmnopqrstuv]* and most of the letters are in [deghru]*]
X-ME-VSCategory: clean
X-ME-ZSResult: clean

Guesses:
X- means nonstandard/locally defined, as I recall. ME = MessagingEngine?
VS=Virus Scan
ZS=????? Scan

The string is very curious!!

I found 0 Google hits.
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Old 1 Feb 2019, 11:34 PM   #22
paleolith
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FM engineers have changed my profile to assign a score of 2 instead of 5 for the VADESPAM hit, using a tag ME_VADESPAM_LOW. For me, this is sufficient; had the score been 2 from the start, I'd have seen no false positives and would not even have noticed the new test. Presumably they can do the same for others who have trouble with the test. It has to be done through support and requires a few hours to take effect.

I received more information from an FM engineer, who gave me permission to repost the info. The following is a mixture of the engineer's explanations and my own words.

I think that all tags containing the string "VS" refer to Vade Secure. I don't know whether it's coincidental or intentional that VS can also stand for Virus Scan. Vade Secure is a spam filtering service which FM has begun using. I don't know many details about Vade Secure. In particular, I have no idea what they are doing that the traditional tests don't, except that they are getting data from a variety of sources and thus have the potential to react to fast-developing spam situations far more quickly.

Info from the engineer:
  • X-ME-VSCategory is the classification category of a message by VadeSecure;
  • X-ME-VSCause is an encoding of the reasons for that classification;
  • X-ME-ZSResult is the classification of the message sending IP address by another product we are investigating, at present this is for data gathering only.

I'm also told that they are working on ways to mitigate false positives more quickly, though with no promises of dates or other specifics, just that FM is aware of the issues which have arisen.

Edward
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Old 4 Feb 2019, 11:03 PM   #23
SideshowBob
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I think ZS is probably ZEROSPAM.
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Old 5 Feb 2019, 04:37 AM   #24
elvey
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Cool

Thanks! Super helpful info, and I'm glad to hear fastmail is on the ball, as usual, re. spam detection.
A user tell me more sex solicitation-type spam is evading detection lately. (But it's being forwarded here, which, I explained, makes spam detection tougher.)
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