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Date: Tue, 23 May 2006 11:52:40 -0500
From: Vulpes Velox <v.velox@vvelox.net>
To: Evren Yurtesen <yurtesen@ispro.net.tr>
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Cc: Derek Ragona <derek@computinginnovations.com>,
	freebsd-questions@freebsd.org
Subject: Re: e-mail server farm question
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On Tue, 23 May 2006 10:35:51 +0300
Evren Yurtesen <yurtesen@ispro.net.tr> wrote:

> 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.

Maildir is nfs safe and does not require locking. Thus multiple
programs can safely use it.