Flute Mail is described as 'A multi-provider email API with guaranteed better deliverability. Fixes and retries failed deliveries across multiple providers. Works with SendGrid, Mailgun, Amazon SES, SparkPost and more'. There are more than 10 alternatives to Flute Mail for Online / Web-based, SaaS, Self-Hosted solutions and Windows. The best alternative is Sendinblue, which is free. Other great apps like Flute Mail are Sendgrid (Freemium), Mailgun (Paid), Mailjet (Freemium) and SENDER (Freemium).
Scalable email delivery for transactional email SendGrid transparently handles DKIM, SPF, ISP rate limits, content inspection, bounces, and spam reports to help users achieve higher deliverability. SendGrid integrates in minutes by just changing three SMTP settings.
Amazon Simple Email Service (Amazon SES) is a cost-effective outbound-only email-sending service built on the reliable and scalable infrastructure that Amazon.com has developed to serve its own customer base.
API & Integration Amazing RESTful API? Powerful SMTP injection? We’ve got you covered. SparkPost helps developers hit the ground running to work with email, because we’re built for developers by developers to get email integration right.