Error on collecting emails

Hello everybody,

in our student lab instance of AXELOR we are running into a strange problem:

Our server has three network interfaces. When we are setting up new users and also setting up email accounts for them (POP or IMAP), we can validate the given usernames and passwords.
But when we try to collect emails from those account, there is the following error message appearing:

Internal Server Error
Extra route-addr

So what is wrong here? The backtraces in maintainance are not recording the error …

Thanks for your help,


It would be enormously helpful if you could furnish me with both the error trace and the relevant configuration details, such as which button the error is generated.