SAWOL will be fine here up to 100k records per search (doubt you’ll exceed 100k dogs with the same month & date anytime soon)
you’d want to send it using postmark or similar api email provider also so the email sends are managed and spaced out a bit slower than SAWOL might run. and also so you get email log reports and can track opens and manage unsubscribes etc
you may also want to add rules so that emails only send within certain hours or to certain segments (ie users subscribed to marketing)
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