Understood, But now one question, now i have in dbmail.conf SHA1, can i change now for "SHA1,TIGER"? I mean, the emails that were inserted with SHA1 there's no problem?
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul J Stevens Sent: segunda-feira, 11 de Fevereiro de 2008 7:33 To: DBMail mailinglist Subject: Re: [Dbmail] Hash algorithm You can use any of the supported hash algorithms. It doesn't *really* matter which one you choose as long as the hash field is wide enough to contain it. It is a matter of balance and trade-off. During message insertion the hash is used to quickly locate mime blobs with the same hash signature. The blobs located are then compared byte-by-byte (memcmp) to make sure it is the exact same one as the one we're inserting, and only then do we skip inserting this blob again. If you use a short hash, like md5, the chances of hash-collisions are much higher, and dbmail will have to examine more blobs byte-by-byte. So for short hashes dbmail will (probably) take longer to investigate more blobs, but short hashes will (probably) be located faster by the database index-scanner. I suspect it is a trade-off, but I don't know! It most likely depends on the size of your storage and the database backend. I would advise you to stay away from the really long hashes since I'm pretty sure the index will become too large and expensive. SHA1 or TIGER are excellent hashes for the purpose at hand. Jorge Bastos wrote: > Ops > > Ignore this, i forgot to restart the server!!! > > > > > > *From:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] *On > Behalf Of *Jorge Bastos > *Sent:* domingo, 10 de Fevereiro de 2008 22:35 > *To:* DBMail mailinglist > *Subject:* Re: [Dbmail] Hash algorithm > > > > I'm having this: > > > > Feb 10 22:31:13 lira dbmail/lmtpd[32337]: Warning:[misc] > dm_misc.c,dm_get_hash_for_string(+2395): hash algorithm not supported. > Using SHA1. > > > > What should i do? > > I have in dbmail.conf: > > > > hash_algorithm = SHA1 > > > > > > ----- Original Message ----- > > *From:* Jorge Bastos <mailto:[EMAIL PROTECTED]> > > *To:* DBMail mailinglist <mailto:[email protected]> > > *Sent:* Sunday, February 10, 2008 10:06 PM > > *Subject:* [Dbmail] Hash algorithm > > > > Hi, > > > > For 2.3x, wich Hash Algorithm should i use? > > SHA1/SHA256/TIGER? > > > > Jorge > > ------------------------------------------------------------------------ > > _______________________________________________ > DBmail mailing list > [email protected] <mailto:[email protected]> > https://mailman.fastxs.nl/mailman/listinfo/dbmail > > > ------------------------------------------------------------------------ > > _______________________________________________ > DBmail mailing list > [email protected] > https://mailman.fastxs.nl/mailman/listinfo/dbmail -- ________________________________________________________________ Paul Stevens paul at nfg.nl NET FACILITIES GROUP GPG/PGP: 1024D/11F8CD31 The Netherlands________________________________http://www.nfg.nl _______________________________________________ DBmail mailing list [email protected] https://mailman.fastxs.nl/mailman/listinfo/dbmail _______________________________________________ DBmail mailing list [email protected] https://mailman.fastxs.nl/mailman/listinfo/dbmail
