On 9.4.2012, at 22.39, Alexander Chekalin wrote: > Hello, Timo, > > I feel a bit unsure about "which 'date' I mean", since I always consider the > only date from Date: header. But which value is used as INTERNALDATE then? As > soon as I use (for now) maildir storage type, all the metadata are stored in > messages. So I expect Dovecot somehow parse and use Date: field itself, or > I'm wrong with it?
The INTERNALDATE means the same as "received date", while the Date: header is the "sent date". With mbox format the received date is stored in the separating From-lines. IMAP supports searching and sorting messages by either INTERNALDATE or Date: header > And also what's about messages without Date header at all? The searching just doesn't match those messages then. Sorting falls back to using received date. > But the Date isn't the worst thing. Look, to have my archive work I setup > server-side filter which redirect all messages it processed also to my > archive mailbox. This way, each message (after such a redirect) targeted to > 'archive@mydomain', instead of its original destination email. The only place > I can find out the original recipient is to parse 'Recieved' field(-s). > > As I think I understand that none of these headers (Date or Received) are to > be used for SEARCH anyway, and this was the idea behind creating my own > index. But wait, is there any way I can make Dovecot also index additional > fields (yes, I talk about 'Received') - then it'll be the best solution! If you do a SEARCH HEADER Received, then Dovecot adds the Received headers to dovecot.index.cache file and the subsequent searches should be quite fast, although the Received headers increase the cache file's size quite a lot. Also alternatively you can enable full text search indexes (Lucene or Solr) and the search is then done from them.
