Hi All,
This is my first post so forgive me if this hits the wrong list.
I have been using dovecot for years happily with SendMail on mainly
CentOS servers, and my customers are starting to more and more use
Thunderbird, so my perfect model is:
Linux --> Dovecot --> SendMail --> Thunderbird (or mobile phone e-mail app).
I do have some customers using Outlook or Windows Live Mail, and these
are for the most part working fine with IMAP - I don't do POP.
My mod to the dovecot.conf file:
disable_plaintext_auth=no
My mod to conf.d/10-mail.conf:
#mail_location =
mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u
My mod to conf.d/10-master.conf:
#default_internal_user = dovecot
service imap-login {
inet_listener imap {
port = 143
}
inet_listener imap_second {
port = 10143
}
inet_listener imaps {
#port = 993
#ssl = yes
}
- I do the 10143 bit so I can pseudo hide port 143 for clients with
devices that access both internally and externally - port forwarded on
MikroTik routers for my customers.
All goes well for many years with the above configs, and continues to be
awesome as always.
Under the user's ${HOME} directory they end up with a lovely 'mail'
directory and all of the e-mail client folders live in harmony under there.
This weekend I am helping a customer cut over his customer from legacy
POP based e-mail uses with splatterings of Outlook 2010 and 2013
throughout the company, to using Linux with IMAP in the setup as
described above as per my standard configs.
The issue starts when you add an IMAP user to the Outlook client and
upon opening it, initially, it tries to find a "Sent" Items folder under
IMAP to send from. To this end I have traditionally gone into the
dialogue box that opens, click on the IMAP account to receive a list of
possible folders, but it now immediately crashes indicating Outlook has
had an error, and it all goes to hell from there. Outlook then cannot
open but keeps crashing with its "unknown error".
Up to last week at another site with Windows Live Mail, this was not an
issue.
By modifying the e-mail account via Control Panel, I can delete or
modify the account and try again.
Here is what I found:
If I don't specify a 'root' folder under the "Advanced" tab which also
contains the port selections for 143 and 25, it fails.
If I follow the MS recommended root folder example from Microsoft and
use INBOX, or Inbox, it 'does' stop the error but you can't create
subfolders - I am assuming as this is picking up the .imap/INBOX folder
or something and makes sense that it can't create folders under
INBOX/Inbox, particularly if this is a file rather than a directory that
dovecot/Outlook are pointing to.
What I have found is I can 'lie' to Outlook and put in a 'mail' folder.
This results in a ${HOME}/login_name/mail/mail folder, but I don't care,
as it happily puts files under mail/mail.
Now here is something totally strange: If I try to put this same account
on another PC so users can 'share' the same e-mail account, even with my
'mail' root folder work-around, it crashes again.
All through this, Thuderbird works fine and so does RoundCube - SOGo
will be up and working a bit later once I get the initial part up and
going... but I digress but good to know it is only Outlook doing this.
To share multiple accounts I am currently getting the subsequent PCs
that need to share a universal account to select a root folder mail2,
mail3 etc. I then delete these folders and symbolic link the mail2,
mail3 etc to the mail directory - yucky fix, but kind of works with some
auto scripting of .subscriptions to follow so all of the Outlook clients
sync to the one 'real' root folder.
I have never seen this before and have customers running all kinds of
IMAP e-mail clients to dovecot on Linux.
I saw an MS posted bug on something for IMAP and they recommend rolling
back MS updates to fix it - but I am not sure the client can or will do
that.
This kind of random issue that only affects this site at present is why
I only recommend people use e-mail clients like Thunderbird because it
just 'works'. The users at this site would not switch and will cite they
have been working in a POP situation on their other Linux box since Adam
was a boy.
Any help would be very much appreciated.
I like to think I can do this with my eyes shut by now, but this one has
got me stumped.
--
As always, I remain at your service.
Kindest Regards,
David.M.Clark (Director - Senior Linux/UNIX Consultant)
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