Step 6: Specify configuration statements in SMTP configuration data set
Copy the member SEZAINST(SMTPCONF) to your own SMTP configuration data set and modify it for your site using the SMTP configuration statements.
Note: If the SMTP configuration data set is a sequential
data set, you cannot edit the data set while SMTP is running. If
the data set is a PDS member, it can be edited while SMTP is running.