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From "Mike Streeton" <>
Subject RE: indexing emails
Date Mon, 19 Jun 2006 07:32:51 GMT
When you talk about indexing emails are you indexing Outlook mails? We
have only found a few libraries that will do this and all require
Outlook to be online at the time i.e. you cannot index PST files

As far as indexing goes index each address in a separate un-tokenized
field not space delimited in a single field. It is also useful to put
the To; CC and BCC in a single field to enable you to search to email
you have sent to a person. I would also recommend you do some processing
on the Subject field to remove FW and RE this will allow you to search
by subject and pick up all emails in the thread.


-----Original Message-----
From: Michael Wechner [] 
Sent: 19 June 2006 08:21
Subject: Re: indexing emails

Rob Staveley (Tom) wrote:
> Having spent a lot of time getting this wrong myself in an e-mail
> indexer(!), I urge you to consider whether in your query interface you
> need to look for mail to "john*" rather than, because
> may have been addressed to or If you
> only (untokenised) you will have to use a PrefixQuery to
> for "john*", and you are liable to hit BooleanQuery.TooManyClauses
> if you have more than 1024 (or BooleanQuery.getMaxClauseCount())
> addresses in your index starting with "john". 
> I'm trying to figure out a good design for this now for my own e-mail
> indexing application,

btw, is your code available somewhere, I mean as Open Source ;-) ?


>  considering also whether I should cater for searches
> for "*smith*". I'm coming round to the realisation that WildCardQuery
> PrefixQuery are not great things to depend upon for getting e-mail
> from an index and the right thing to do is to break the address up
> natural tokens ('.' or '-') in one field and leave them intact in
> field. It isn't ideal; e-mail addresses with no separator between
> or first names and last name still need a PrefixQuery or
WildcardQuery, if
> you want to search for last names, but it does make some queries
> which would otherwise blow up.
> -----Original Message-----
> From: karl wettin [] 
> Sent: 16 June 2006 21:13
> To:
> Subject: Re: indexing emails
> On Fri, 2006-06-16 at 15:20 -0400, Michael J. Prichard wrote:
>> I am working on indexing emails and want to have a "to" field.  I am 
>> currently putting all the emails on one line seperated w/
> spaces...example:
>> Then i index that with a StandardAnalyzer as follows:
>> doc.add(new Field("to", (String) itemContent.get("to"), 
>> Field.Store.YES, Field.Index.UN_TOKENIZED));
>> Question this the best way to do it?  I want to be able to 
>> search for and pick out just those Documents, etc.
> You can either do it as above (but you want to TOKENIZE the field) or
> could create a new UN_TOKENIZED field for each email address.
> The second will require less CPU as it does not involve any lexical
> analysis. It will also create larger distance between the addresses in
> index (see span queries and term positions).
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Michael Wechner
Wyona      -   Open Source Content Management   -    Apache Lenya                          
+41 44 272 91 61

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