Youri Kravatsky wrote:
>    Hello, Eric!
> 
>>> I investigated this problem more thoroughly and what can I say - qmail
>>> really REJECTS letters to non-existent users of ja-maica.ru (e.g.
>>> s...@ja-maica.ru), but ACCEPTS mails for users like
>>> (s...@www.ja-maica.ru) - it tries to work as MX server for all hosts at
>>> the networks. Probably, it's not the problem of chkuser/spamdyke, but
>>> the qmail itself? Can it be fixed to changing rcpthosts strings to
>>> something like @ja-maica.ru?
> 
>> Is your objective to accept or reject messages to the sub-domain(s)?
>      Of course, to reject. Or, well, do not accept emails to hosts
> that are not included directly in rcpthosts file. At least to reject
> to all subdomains of our domains.
> 
>> What subdomains are you seeing besides @www. ?
>     Subdomains of our domains. Mail that goes to domains that are not
> included to
> rcpthosts file is rejected.  But mail to www.mydomain.com or
> mail.mydomain.com are accepted to deliver (to no avail, of course).
> 
Hey Youri,

I think this is part of your problem:
shu...@edwin:~$ host xyz.ja-maica.ru
xyz.ja-maica.ru is an alias for www.ja-maica.ru.
www.ja-maica.ru is an alias for www.dsite.ru.
www.dsite.ru is an alias for dsite.ru.
dsite.ru has address 89.108.80.21
dsite.ru mail is handled by 10 dsite.ru.
shu...@edwin:~$

Any subdomain will find its way to your server.
Is there any reason for the wildcard DNS record(s)?

-- 
-Eric 'shubes'

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