Date: Tue, 23 May 2006 19:50:51 -0500 From: Vulpes Velox <v.velox@vvelox.net> To: Evren Yurtesen <yurtesen@ispro.net.tr> Cc: FreeBSD, "Chad Leigh -- Shire.Net LLC" <chad@shire.net>, Mailing List <freebsd-questions@freebsd.org> Subject: Re: e-mail server farm question Message-ID: <20060523195051.05eb3a77@vixen42.vulpes> In-Reply-To: <4472C73C.9040501@ispro.net.tr> References: <4471ABF0.3090804@ispro.net.tr> <6.0.0.22.2.20060522102107.0274be28@mail.computinginnovations.com> <4471ECAA.3030406@daleco.biz> <20060522231641.7d63db65@vixen42.vulpes> <4472BB57.7020001@ispro.net.tr> <76921773-B1C7-4500-8FE7-78B815961860@shire.net> <4472C73C.9040501@ispro.net.tr>
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On Tue, 23 May 2006 11:26:36 +0300 Evren Yurtesen <yurtesen@ispro.net.tr> wrote: > Chad Leigh -- Shire.Net LLC wrote: >=20 > >=20 > > On May 23, 2006, at 1:35 AM, Evren Yurtesen wrote: > >=20 > >> Vulpes Velox wrote: > >> > >>> On Mon, 22 May 2006 11:54:02 -0500 > >>> Kevin Kinsey <kdk@daleco.biz> wrote: > >>> > >>>>> At 07:17 AM 5/22/2006, Evren Yurtesen wrote: > >>>>> > >>>>>> Hello, > >>>>>> > >>>>>> I was wondering how does services like yahoo mail is storing > >>>>>> e-mails. Somehow the smtp server should know where to deliver > >>>>>> the mail inside the system and webmail should know from which > >>>>>> server to read it from. > >>>>>> > >>>>>> Does anybody have any practical ideas about how it is done? > >>>>>> > >>>> > >>>> Derek Ragona wrote: > >>>> > If you are using sendmail, as most FreeBSD users are, you can > >>>> > check the sendmail.org site for information on mail handling. > >>>> > There are a number of methods that depend on your setup. > >>>> > > >>>> > >>>> Well, it's pretty obvious that they aren't using a stock > >>>> SendMail: > >>>> > >>>> # telnet mx2.mail.yahoo.com 25 > >>>> Trying 67.28.113.72... > >>>> Connected to mx2.mail.yahoo.com. > >>>> Escape character is '^]'. > >>>> 220 mta309.mail.re4.yahoo.com ESMTP YSmtp service ready > >>>> > >>>> Short of finding an article written by someone 'in the know', > >>>> or an answer for someone like that, we can only guess. I'd > >>>> probably start with guessing a big DB on a large SAN; > >>>> which pretty much negates the "which server to read from" > >>>> question (up to a point). Everything else is pretty > >>>> academic. SMTP, IMAP, POP. > >>> > >>> Maildir makes it easy to distribute it across multiple machines > >>> as well. > >> > >> > >> What do you mean exactly? distributing 1 user's mails into > >> seperate machines? I didnt understand how Maildir helps to this > >> actually. > >> > >=20 > > I am not sure anyone was talking about distributing 1 person's > > mail across separate machines. The discussion seemed to be how > > to handle large amounts of mail spread out across machines, which > > maildir helps with as you can have one or more file servers and > > lots of consumers (imap/pop) and deliverers (mta) accessing those > > maildirs on your file servers. Combine with a backend database > > of some sort (we use an ldap db that includes the path for a > > specific accounts mail) and voil=E1. > >=20 > > Chad > >=20 >=20 > Ah sorry, I didnt think it that way for a moment. I thought you > meant Maildir stores mails in seperate files compred to mbox format > used by sendmail so...anyhow my mistake :) But it is possible to > make changes to sendmail so that it will store to different folders > also. Maildir does store mail in serperate files. Each email is a file. http://en.wikipedia.org/wiki/Maildir =20 > I think the conclusion is a database, multiple smtp servers > querying database to see where to forward received e-mails, > multiple pop3/imap servers querying database to see from where to > read the e-mails and multiple storage machines. This way it can > scale to an unlimited size. >=20 > So it requires a lot of coding :) Nah, once you get everything installed and configured it is easy. Dovecot and qmail are both easy to set up. Then just a bit of shell scripting for a user adding and removing script.
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