IMAP server with multiple mail account on multiple mail clients

Hello,
I have the following problem that I would like to share with the community in order to find a solution.
On my Mac OS X Maverick (OS X 10.9.3 (Build 13D65)) Server (Server 3.1.2 (Build 13S4517)) I configured dovecot (Ver. 2.2) as IMAP server.
I created 8 email accounts on the server and I started the email traffic on the system.
It works well and it sound good! But...
I started to configure different mail clients (i.e. OS Mail, Thunderbird, Outlook (different release, same behavior)) on different client machines (i.e. Mac OS X, Windows xxx, Lubuntu 14.04).
On each client I have to configure all 8 emails accounts previously created on the Server and...
Something strange start to appear...
1. On the dovecot error file a lot of messages appear like the following:
    Jul 02 16:56:55 imap(pid 15241 user <xxxxx>): Fatal: setuid(505(<xxxxx>) from userdb lookup) failed with euid=506(<yyyyy>): Operation not permitted (This binary should probably be called with process user set to 505(<xxxxx>) instead of 506(<yyyyy>))
   but also if it's not normal there are not problems and dovecot works fine...
2. Sometime on the Thunderbird and Outlook clients a message that says that some account has been disconnected appears...
   but also this problem appears a false because by moving on the different accounts configured I'm able to see the right emails present on the Server
3. On the OS Mail clients I see continuously error messages that say that some account has been disconnected...
   but also in this case the problem appears a false because by moving on the different accounts configured I'm able to see the right emails present on the Server (also if with some trouble more than the other email clients...)
Now, the question is: have you may be information about problems with this kind of configuration? Maybe am I trying to make something that at the moment is not possible to be made? Or, have I found a bug (or more than one) in the components that I'm using?
Thanks a lot to all the people that will help me

Assuming you're on a NAT'd network, DNS services can cause all sorts of weird errors with the mail server, including spontaneous name changes.
To verify local DNS services, launch Terminal.app from Applications > Utilities and issue the following harmless diagnostic message:
sudo changeip -checkhostname
You'll need to enter an administrative password for the sudo, might see a one-time informational message around the usage of sudo, then you'll see some host and network configuration information, and finally an indication that either no changes are required, or that there are local DNS or the network has configuration issues. Also, make sure you're not using .local or .arpa as the top-level domain within the DNS services.
Public DNS for the mail server can also cause communications issues, if that's not configured correctly — that won't cause the issue you're seeing in the logs here, but it will cause inbound mail to not reach your server, and outbound mail from your server to be dropped by the remote server. To verify your public DNS, launch Terminal.app from Applications > Utilities and issue the commands discussed in this thread or this thread and confirm that your internal and external MX record and your internal and external forward and reverse DNS settings are all correct.

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