Hi @jain1d
The answer to both your questions is yes and yes..
If you want to trigger once a month, you need to change the trigger the "Scheduled" and define the recurrence you want your Flow to run.
Regarding the second one, I would keep a simple SharePoint list with the ones that got the email and, before posting the message, check the list to see if the value is there. Then you would avoid duplicates.
Can you please check if and let me know if you have any questions?
Cheers
Manuel
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