New subject: Configuring LMTP/IMAP proxy

22 Dec 2014 · *Usuario Linux*

      Hi,
First, my version:
[root@centos1 conf.d]# dovecot --version
2.2.15
[root@centos1 conf.d]#
I have already configured dovecot that way (on one single VM, so everythinh is stored on the same machine)

     A post fix server sending out to LMTP

     LMTP is the dovecot LMTP server, configured with "lmtp-proxy= no",

     LMTP checks the users receiving messages by using Linux passwd file "userdb"  section in auth-passwdfile.conf.ext,

     IMAP LOGINS are authenticated using DIGEST-MD5 also configured in auth-passwdfile.conf.ext :

Authentication for passwd-file users. Included from 10-auth.conf.
#
# passwd-like file with specified location.
# 
passdb {
driver = passwd-file
args = scheme=DIGEST-MD5 username_format=%n /etc/dovecot/users.DIGEST-MD5
#args = scheme=CRAM-MD5 username_format=%n /etc/dovecot/users.CRAM-MD5
}
userdb {
driver = passwd
# Default fields that can be overridden by passwd-file
#default_fields = quota_rule=*:storage=1G
default_fields = uid=root gid=root home=/home/%n
# Override fields from passwd-file
#override_fields = home=/home/virtual/%u
}
This works fine, I can send messages through SMTP, and read them using IMAP access.
But now, I woukd like to have  amore structured architecture with :

     A LMTP server configured as PROXY : has to identify the user, and proxy the request to the backen LMTP server (where its mailbox will stand)

     On backend, I also have  to start another  LMTP serevr, but not configured in proxy mode of course,

     Same for IMAP : IMAP proxy first checking LOGIN credentials, and then forwarding to IMAP server running on backend.

As a first step, I would like to continue using my files to authenticate uses (so passwd file , and users.DIGEST-MD5), but final goal will be using a MySQL DB.
So my main question are :

 I just made a test and changed  "lmtp_proxy" to "yes" in my 20_lmtp.cong file, but, strangely, this did not cah nge anything ! The LMTP process still receives mails and stores them on the local host ,

 Are there any documentation describing this process in details ? I only found some pieces on wiki pages, but not enough unfortunately ...

 Are there some configuratiion files ready to use for my configuration.

Thanks in advance.
Cordialement.
Guenhaël.
This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message.

Configuring LMTP/IMAP proxy

Le Moing, Guenhaël

Authentication for passwd-file users. Included from 10-auth.conf.

Manuel Delgado

tags

participants (2)