Congratulations on launching, great idea. Can I ask you about AWS lambda for the email sending. Did you integrate with a third party email service, or node mail

Congratulations on launching, great idea. Can I ask you about AWS lambda for the email sending. Did you integrate with a third party email service, or node mailer, or just a Gmail (I believe they get throttled at 500 emails per day). Or does AWS send the emails? I'm working on a project that needs emails to go automatically and I'm not sure on the best implementation yet, I'm leaning towards the Gmail option but don't want to hit the limit. Thanks