[Dovecot] Default domain ?

[Marius Stan]

Hello,

I'm in the process of migrating from qpopper to dovecot and I've 
stumbled upon the least expected thing:
In qpopper I can specify a 'default domain', which will be used if an 
user will only issue his username (not the whole email address) when 
logging in. Because of this, the users in my main domain don't use the 
whole email address when getting their mail.
I'd hate to have to call each of them and guide through their OE menus 
to fix this issue, so I must ask:
Is there any way at all of specifying a default domain in dovecot ?

Thanks,
Marius