Hi Tom,
We use Dovecot, but its not Dovecot changing the message header its MS
Outlook 2013. It's not just a local copy (pst file) that's being
changed; the server copy is being changed by Outlook as well. We ran
into this when trying to train DSPAM on messages moved from the inbox to
a spam folder and I noticed that the messages had most of the header
removed. Subsequently we had to use Thunderbird to move message into the
spam folder from the inbox to train DPSAM. This is just one of the links
where this subject is discussed:
https://social.msdn.microsoft.com/Forums/en-US/8eafe714-8a8c-44bc-9228-d6a68731494f/outlook-2013-behavior-as-an-imap-client?forum=os_exchangeprotocols
Eric
On 2/26/2015 4:14 PM, Tom Hendrikx wrote:
> Hi Eric,
>
> Does the change also happen on the IMAP server, or only in the
> client's local cache? Which IMAP server is that?
>
> I'm no expert, but AFAIK the client tells the server to move the
> message around. There is no way for the client to tell the server to
> remove or change message data. But it might download, edit, upload
> again, then delete old copy, but in IMAP terms this would be
> completely new message.
>
> Tom
>
> On 26-02-15 23:52, Eric Broch wrote:
> > Hi Tom,
>
> > I have a client who uses MS Outlook 2013. It strips some of the
> > header when moving email between IMAP folders. Have you heard of
> > this? Leave it to Microsoft to break RFC protocol.
>
> > Eric Broch
>
> > On 2/26/2015 3:06 PM, Tom Hendrikx wrote:
> >> On 26-02-15 22:23, David Mehler wrote:
> >>> Hello,
> >>
> >>> I'm having an issue where spam messages are delivered to a
> >>> Spam mailbox via sieve, but to retrain I have to move them to
> >>> the inbox or another folder. Well, the subject ***spam***
> >>> header is still there and the message headers are still showing
> >>> a status of spam and in the message the text identified as spam
> >>> is appended. I was thinking the headers would be rewritten on a
> >>> retrain and that text message would also be redone. I'm
> >>> concluding my retraining is not working. If I need to provide
> >>> logs let me know.
> >>
> >> The message cannot be rewritten. this is IMAP protocol which says
> >> that once a message has been delivered, no changes may be made to
> >> it. There is also no reason for rewriting: the message is
> >> already delivered, so the headers won't be used anymore for
> >> filtering or delivering.
> >>
> >> If you want to know whether training worked, try this:
> >>
> >> - Find a message you want to retrain (and didn't retrain before)
> >> - Run dspam_stats for the user you're training - Move the message
> >> so dovecot antispam will run your retrain command - Run
> >> dspam_stats again: it should show the change by decreasing a
> >> counter (one of true positive/negative) and increase another (one
> >> of false positive/negative). - The DSPAM system or user log (if
> >> enabled) should also have an entry appended that mentions
> >> Retrained
> >>
> >> If it failed, your regular dspam logging should contain an error
> >> message.
> >>
> >> Tom
> >>
> >>
> >
> ------------------------------------------------------------------------------
> >>
>
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>
>
>
> >
> ------------------------------------------------------------------------------
>
>
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> > by Intel and developed in partnership with Slashdot Media, is your
> > hub for all things parallel software development, from weekly
> > thought leadership blogs to news, videos, case studies, tutorials
> > and more. Take a look and join the conversation now.
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>
> > _______________________________________________ Dspam-user mailing
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>
>
>
------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website,
sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub
for all
> things parallel software development, from weekly thought leadership
blogs to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/
> _______________________________________________
> Dspam-user mailing list
> Dspam-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/dspam-user
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Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
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