With V5R2 and above, you can use the CHGSPLFA command to set the user defined data of a spool file. 
For example: To set the To email address and the subject line, type:
CHGSPLFA FILE(QSYSPRT) USRDFNDTA('SUBJ:This is a test~MAILTO:support.rjs@helpsystems.com;info.rjs@helpsystems.com~')
For example: To set only the To email address, type:
CHGSPLFA FILE(QSYSPRT) USRDFNDTA('MAILTO:support.rjs@helpsystems.com;info.rjs@helpsystems.com~')

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Last Modified On: December 10, 2016