This turned out to be an Outlook 2007 bug.
There was an empty line in courierimapsubscribed.
Please consider mentioning it somewhere.

#!/bin/bash
#
# Find 'courierimapsubscribed' files with an empty line.
# Could be a weekly cron job.
#
# SOURCE   
:https://www.howtoforge.de/forum/threads/courier-imapd-fehlermeldung-error-reading-acls-for-invalid-argument.3768/#post-27735

MAIL_BASE="/var/mail"

for CISSD in $(find "$MAIL_BASE" -type f -name "courierimapsubscribed"  
-exec grep -l '^$' \{\} \;); do
     echo "Empty subscription: ${CISSD}" >&2
     # correct it
     sed -i '/^$/d' "$CISSD"
done






Idézem/Quoting Szépe Viktor <[email protected]>:

> Good morning!
>
> I've read in an old thread that stock Debian /var/mail is for mboxes
> not for Maildirs.
>
> My permissions are:
>
> ls -ld /var/mail/szepe.net/viktor/Maildir/new/
> drwx------ 2 virtual virtual 208896 Jan 19 16:22
> /var/mail/szepe.net/viktor/Maildir/new/
>
> ls -ld /var/mail/szepe.net/viktor/Maildir
> drwx------ 31 virtual virtual 4096 Jan 19 16:21
> /var/mail/szepe.net/viktor/Maildir
>
> ls -ld /var/mail/szepe.net/viktor
> drwxr-s--- 3 virtual virtual 4096 Feb 17  2011 /var/mail/szepe.net/viktor
>
> ls -ld /var/mail/szepe.net
> drwxr-s--- 7 virtual virtual 4096 Nov 27 20:39 /var/mail/szepe.net
>
> ls -ld /var/mail
> drwxrwsr-x 11 daemon daemon 4096 Jan 19 13:48 /var/mail
>
> id virtual
> uid=1999(virtual) gid=1999(virtual) groups=1999(virtual)
>
>
> Could you help me find the cause of these messages:
>
> Jan 19 15:36:20 szerver imapd-ssl: Error reading ACLs for : Invalid argument
>
> I only get these in the syslog for *one* specific user. All users have
> the same permissions/other settings.
> Could it be her mail client?
>
>
> Szépe Viktor
> --
> +36-20-4242498  [email protected]  skype: szepe.viktor
> Budapest, XX. kerület
>
>
>
>
>
> ------------------------------------------------------------------------------
> New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
> GigeNET is offering a free month of service with a new server in Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________
> courier-users mailing list
> [email protected]
> Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users


Szépe Viktor
-- 
+36-20-4242498  [email protected]  skype: szepe.viktor
Budapest, XX. kerület





------------------------------------------------------------------------------
New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
GigeNET is offering a free month of service with a new server in Ashburn.
Choose from 2 high performing configs, both with 100TB of bandwidth.
Higher redundancy.Lower latency.Increased capacity.Completely compliant.
http://p.sf.net/sfu/gigenet
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