If this question came up at work, I would recommend a Lambda function that sends email via SES and is triggered periodically by a CloudWatch event. It would be

If this question came up at work, I would recommend a Lambda function that sends email via SES and is triggered periodically by a CloudWatch event. It would be cheap and require basically no admin overhead once set up. That said, there are probably different forces at play if this is a personal infrastructure question: while cheap is good, if you aren't fluent in AWS it may be a slog to set up. If you're not, easiest thing is probably a real cron job run on a cheap VPS.