To get a "full report" I gather all output in file like report.txt.
Between activity steps I add a line like
'echo -e "******** start script ******** at "$(date) \n>>report.txt'
I use the local postfix listening only on localhost (maybe GWIA is on the same machine). Postfix will relay via GWIA.
Finally this statement will close my script:
mail -s "Backup for XY has been done - $(date)" email@example.com <report.txt
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