Indexing arbitrary mail headers
By default the Recoll mail handler only processes a subset of email headers (From, To, Cc, Date, Subject). It is possible to index additional headers by specifying them inside the 'fields' configuration file, inside the configuration directory (typically '~/.recoll/').
Lengthy explanations are not really needed here, and I’ll just show an example (duplicated from the configuration section of the manual):
[prefixes] # Index mailmytag contents (with the given prefix) mailmytag = XMTAG [stored] # Store mailmytag inside the document data record (so that it can be # displayed - as %(mailmytag) - in result lists). mailmytag = [mail] # Extract the X-My-Tag mail header, and use it internally with the # mailmytag field name x-my-tag = mailmytag
Limitations:
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The mail filter will only process the first instance for a header occurring several times.
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No decoding will take place (ie for non-ascii headers which would have some kind of encoding).