Verifying mail workload compatibility with SMTPD

SMTPD will be removed from z/OS® and CSSMTP in the future. You can use the TestMode feature of CSSMTP with EZBMCOPY to verify whether your mail workload is compatible with CSSMTP before you make the switch. For more information, see Withdrawal of SMTPD and sendmail in z/OS Communications Server: IP Configuration Guide.

When you run CSSMTP with TestMode set to YES, the only output that CSSMTP produces is error messages for noncompliant mail messages. Because CSSMTP uses its normal error reporting mechanisms to report these errors, ensure that you configure a valid destination for CSSMTP error reports. You must have a valid destination for these reports and search the reports in the correct place to ensure that you can detect any mail workload that is not compatible with CSSMTP.

When CSSMTP running with TestMode set to YES completes a JES spool file, CSSMTP deallocates the file if no errors are found. If errors are found, it handles the spool files according to the setting of the BADSPOOLDISP configuration statement.

If you run CSSMTP with SMTPD to test compatibility of your mail workload, ensure that you set TestMode to Yes in the CSSMTP configuration file. This parameter cannot be changed dynamically, so you must stop and restart CSSMTP if it is set incorrectly. If you do not set the parameter, CSSMTP delivers mail messages that do not contain errors, resulting in duplicate mail messages being delivered if SMTPD also runs and delivers mail messages.