This behaviour is intentional.

> A user need to send a domn XLS file to 10 other people in the other factory unit,

One solution is to create an expansion alias at the other end of the line 
and address to that alias. Another one is to use serialmail with some sort 
of duplicates recognition (Russell Nelson has a script that does that for 
one user).

The simplest solution in your case may be to use Postfix instead. Qmail is 
not perfect in every infrastructure.

Regards, Frank

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