Hi! I have a patch and several thoughts about FTS in dovecot. I. SOLR v5.1 and above doesn't allow GET /select queries with Content-Type header set, so, I just removed it from the code: --- dovecot-2.2.18/src/plugins/fts-solr/solr-connection.c 2015-05-13 17:14:45.000000000 +0300 +++ dovecot-2.2.18.patch/src/plugins/fts-solr/solr-connection.c 2015-09-27 19:47:40.363843359 +0300 @@ -432,7 +432,6 @@ solr_connection_select_response, conn); http_client_request_set_port(http_req, conn->http_port); http_client_request_set_ssl(http_req, conn->http_ssl); - http_client_request_add_header(http_req, "Content-Type", "text/xml"); http_client_request_submit(http_req); conn->request_status = 0; After that it works just fine. And it seems it doesn't hurt compatibility with older versions. Tested with 3.1, 3.6.2, 4.10.4, 5.3.1 So, I think this patch should be included. II. Fuzzy search. As I understand dovecot searches the same way despite FUZZY word is given or not. In my case I'd like to have an ability to make lookups like "domain.com usernamepart" (usernamepart - part of localpart). So, I use '<str name="defType">edismax</str><int name="qs">15</int>' inside requestHandler /select in solrconfig.xml. It's very convenient for users. Besides other things, this makes searches "abc@def" and "def@abc" identical to dovecot. But the problem is that sometimes the exact match is necessary. E.g. when using "doveadm expunge". For now I found a workaround - remove fts plugins while using doveadm with -o "`dovecot -n | sed -n 's/"//; s/ *= */=/; /^mail_plugins/s/\("\| fts\(\|_[^ ]\+\)\)//gp'`". But I think users should have an ability to decide which search type to use. Here is what I'm suggesting: 1. Implement fts_fuzzy_default option (default - true, current behavior). false should disable fuzzy search by default. 2. Make a way for fts backend to choose which search type to use. For solr it would be an ability to specify: a) "handler" (default=select) and "handler_fuzzy" (default=select or handler's value) (the same as handler by default). After this you have to create second select-like handler with fuzzy capabilities in solrconfig.xml. Example: fts_solr = url=http://127.0.0.1:8983/solr/dovecot/ handler=select handler_fuzzy=select2 This method will use the same index for both search types. b) "url_fuzzy" URL (different solr core or even address/port), like this: fts_solr = url=http://127.0.0.1:8983/solr/dovecot/ url_fuzzy=http://127.0.0.1:8983/solr/dovecot_fuzzy/ This method will allow to have two completely different indexes. And according to RFC 6203 search query generally may be mixed (FUZZY/EXACT). Both options will be useful in different setups. Hope, these thoughts will help. -- Best regards, Sergey Urushkin