If you are referring to the repeat options, i think these are pretty much self explanatory …
When you enable the Output for the repeat, it will output the data you select to the front end.
So when Include is selected it will output only the columns selected in the output list:
And when Exclude is selected it will output all the columns except the ones selected in the output list:
As for your other question i don’t really understand your idea, so i can’t answer.
I think Tagify could be your friend here. You could have it as an autocomplete to add existing addresses and allow custom ones too. Then you would repeat through the values.
If you wanted you could make the value/text for the tagify something like:
for the name (use the default so custom added email addresses use the email as the ‘to name’)
Don’t forget to add a Tagify component through the UI. Copy/Paste the code will not add the necessary includes to your page unless you already have Tagify on that page