How to send a job log/Spool once the job completed?

Could you please help me how to send a job log/Spool once the job completed.

There was an option is available System Send mail to send a mail once the job completed . So could you please help me how we can send a job log using this option .

I have tried the below but i didn't get any mail . Could some one help this please !

For example :

Job chain name : Test_spool

                Step1 : Reportstep

                                Job definition u2013 XXX_YYY

                Step2:  Mailstep

                                Job definition: system_mail_send

Expression :  Reportstep,job<(what i need to mention here )>:reportstep/log.txt

Check the ablove mentioned is correct and correct me , still i didnu2019t get the log in the mail please .

Thanks

Ramkumar