[Dovecot] Problem with preserving MIME format with Dovecot IMAP and MS Outlook client

[Peter Grimmond]

Hello all,

Apologies for the repost, but I am really struggling to solve this problem...
 
I
 have installed Dovecot 2.0.19 on Ubuntu 12.04 LTS.  I have set up a 
very basic IMAP configuration.  I have two different laptops running MS 
Outlook (one MacOS, one Windows 7) and I have configured both to connect
 to the Dovecot service.  My problem is, emails in MIME format that I 
synchronise from one MS Outlook client are not being correctly decoded 
as MIME messages on the other client.  Instead, the message is rendered 
in plaintext, starting with the lines:

This message is in MIME 
format. Since your mail reader does not understand this format, some or 
all of this message may not be legible.

--B_3426360453_22814Content-type: multipart/alternative;
boundary="B_3426360453_4099"

--B_3426360453_4099Content-type: text/plain;
charset="ISO-8859-1"Content-transfer-encoding: quoted-printable

Can anyone help me understand why this might be happening? 
 
The output from dovecot -n is:
 
# 2.0.19: /etc/dovecot/dovecot.conf 
# OS: Linux 3.2.0-26-generic-pae i686 Ubuntu 12.04 LTS 
 
auth_debug = yes 
auth_verbose = yes
disable_plaintext_auth = no
mail_location = maildir:~/Maildir
 
passdb {
  driver = pam
}
 
protocols = " imap"
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
 
userdb {
  driver = passwd
}
 
Thanks!
 
PG
___

 

Peter Grimmond