Deliver Mailster newsletters with Amazon SES via WEB API or SMTP, with region choice and Amazon SNS bounce handling.
Deliver Mailster newsletters with SparkPost via WEB API or SMTP, with EU endpoint, subaccounts, and bounce syncing.
Deliver Mailster newsletters from a Gmail account using Google OAuth and the Gmail API.
Deliver Mailster newsletters with SendGrid via the Web API or SMTP, with API key checks, categories, and bounce syncing.