Gentoo Archives: gentoo-user

From: antlists <antlists@××××××××××××.uk>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Courier Sub-addressing
Date: Fri, 22 May 2020 15:17:34
Message-Id: 2075bdc5-67c3-ebfd-111a-b5f4c36dd47e@youngman.org.uk
In Reply to: [gentoo-user] Courier Sub-addressing by Ashley Dixon
1 On 21/05/2020 21:14, Ashley Dixon wrote:
2 > Hello,
3 >
4 > I am attempting to set up sub-addressing on my Courier mail server, allowing
5 > senders to directly deliver messages to a particular folder in my mailbox. For
6 > example, I want to provide my University with the address
7 > `ash-AcademicMatters@××××××××××.uk` to force all their messages into the
8 > "AcademicMatters" subdirectory.
9 >
10 > Unfortunately, I can't find any official Courier documentation regarding
11 > sub-addressing. I have found [1], however I'm not sure it will apply as I am
12 > using virtual mailboxes.
13
14 If I understand what you are attempting correctly (not a given!) then
15 what you are trying won't work. You're confusing multiple *folders* with
16 multiple *users*.
17
18 I'm probably not describing this right, but let's say you've got a small
19 business, with a POP3 email account of "business@××××××.uk". However,
20 you've set up a central server with each user having their own account
21 eg John, Mary & Sue.
22
23 So you configure Sue's mail client to have an address of "Sue
24 <sue+business@××××××.uk>". Out in the internet, smtp servers look at the
25 @isp.co.uk bit to deliver it to the right mailserver. Your ISP sees
26 "sue+business", *ignores* the bit in front of the plus, and puts it in
27 the "business" pop account. Your local mailserver now pulls down the
28 email, ignores the bit *after* the +, and shoves it in Sue's email.
29
30 This is, I believe, an RFC so Courier is simply implementing the spec.
31 That's probably why there is precious little Courier reference material,
32 it assumes you have the RFC to hand ...
33
34 I don't know what happens with your "-" example, but it just looks wrong
35 to me. It should be looking for an AcademicMatters POP account, and then
36 delivering the mail to a user account called ash on the server called
37 AcademicMatters. Internet email addresses and domains are read
38 right-to-left (Janet used to be left-to-right, but the Americans won, as
39 usual).
40
41 Cheers,
42 Wol

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Subject Author
Re: [gentoo-user] Courier Sub-addressing Ashley Dixon <ash@××××××××××.uk>