* Ralf Hildebrandt <ralf.hildebra...@charite.de>:

> > In simple, When I send a mail to @example.com,  postfix must send the mail
> > to the MX records of smtp.example.com.

> example.com      smtp.example.com

OK, not too sure if Postfix will perform an MX lookup for the RHS
(smtp.example.com in this example). Please try

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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