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No A, no MX... but still retrying.



Hello.

It happens that my users mistype addresses like: <user.domain@de>. 
Domain 'de' definitely exists. And definitely receives no 
mail. 

Instead of immediate rejection,  I have normal 2-day retry process 
with TRUE :-) diagnostics:

    Nov 16 14:45:07 atrium smtp[23555]: smtp; 500 (nameserver data 
    inconsistency. No  MX, no address: 'de' (NONAME)) r=69

What should I do to provide immediate rejection in case of existing 
non-mail-capable (no A, no MX) domain?

Regards,
Alexey