Weird problem with virtual aliases. Error user has moved to...

[Jaroslaw Grzabel]

Hi,

I've just noticed that the one alias I've had suddenly stopped working 
from unknown reason. I'm using MySQL to keep all domains, users and 
configuration for them and when I send an email to an alias it bounces 
back with error:
<my_al...@meil.me>: User has moved to ja...@meil.me
It's been working for ages and suddenly stopped. Any ideas ?
Thank you for your help in advance.

Regards,
Jarek