Mail bouncing on aliased domain

[kerm1t]

Hi,

I have example.com, with example1.com, example2.com, example3.com as domain alias.

Mail to [email protected] works fine, but mail to any of the aliased domains bounces back "Sorry, no mailbox here by that name". (and yes, I have mail turned on for that alias).

Looking through /var/qmail/control/virtualdomains, I can see:

example.com:4
example1.com:4
example2.com:4
example3.com:4

, which looks correct.

Under /var/qmail/mailnames I see a directory for example.com, but not the aliased domains (which I assume is correct)