The even greater problem with sending email is that your platform will immediately and comprehensively be abused by spammers. To make your email woes go away,

The even greater problem with sending email is that your platform will immediately and comprehensively be abused by spammers. To make your email woes go away, I would recommend using MailChannels [1] rather than SES or SendGrid because MailChannels has a built-in anti-abuse layer that will send you a webhook whenever a bad user is detected. SES will just terminate your account, which probably isn't what you want. Also, at high volume, MailChannels costs less. [1] Disclosure: MailChannels is my company.