Best SMTP Services for Customer.io

Partner with the email service trusted by developers and marketers for time-savings, scalability, and delivery expertise. The Twilio SendGrid Email API and proprietary Mail Transfer Agent (MTA), intuitive console, powerful features, and email experts make it easy to ensure all your email gets delivered in seconds and without interruption. Whether you’re sending 100 emails or 100 billion, SendGrid is built to scale, while maximizing inbox placement and protecting your reputation as a trusted sender. Monitor engagement data and optimize deliverability with our Deliverability Insights dashboard. Integrate with our RESTful APIs and SMTP in minutes, with sample code libraries available in 7 languages, interactive docs, templates, and more.

Email solution for fast-moving teams. We understand how difficult it can be to find an affordable, reliable email service. Mailjet is the ideal solution for you. Our advanced features will help you grow your company at a very affordable price. Passport, our email editor, allows you to create beautiful responsive emails in just a few mouse clicks. You can choose from a variety of templates, or create your own design. Mailjet's Collaboration Toolkit allows you to collaborate on the same campaign or email template in real-time to improve your team's efficiency. You can drastically reduce the feedback cycle by using commenting and approval workflow features to speed up. To send the right content to the right customers, personalize each email by segmenting your contact list and collecting customer data. It's easy for each recipient to feel special. You can optimize the performance of your campaign by integrating real-time statistics with every sending.

Mailgun is an email automation tool that is suitable to developers. Mailgun allows users to access a cloud-based email service that can track, send, and receive emails via their websites and applications. Mailgun supports many programming languages, including Python, Ruby and PHP. Mailgun's tracking feature allows users to track all emails and reduce spam.

Transactional emails: Reach your inbox when it matters most Send personalized, fast transactional emails via API or SMTP. Enjoy the benefits of our global experience sending billions upon billions of emails. Personalized transactional emails are sent to inboxes and not to spam folders. You can customize your analytics with pre-built dashboards and an export API. For assistance, consult our award-winning Support team or read the documentation guides. Use custom tagging and whitelabeling to create conditional content. Globally distributed infrastructure: Automatic SPAM loop registration and prewarmed dedicated IPs. Analytics can be accessed in many ways, including custom tags, A/B testing capabilities and comparative reports. White-labeled click tracking, custom reverse DNS and rules engine are available. Custom return path is also available. This is the average delivery time for top 3 ISPs. It was sent from our MTAs and to the recipient's mail server.