email notification not working after nagios3 migration

[J. Bakshi]

Dear list,

I am using my old (nagios2) configuration files with nagios3. Every
thing is working fine except email notification. Both postfix and mailx
is installed here and postfix is also running well.  Is there any config
in nagios3 which should be enabled  in nagios3 to send email ? 

Please let me know.
Thanks

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