SMTP Services

List of the best SMTP service providers that you can use for email delivery in your third-party app. These platforms have an email API that you can use in your app or website to send transactional and marketing emails.
Last Updated: April 10th, 2026

  1. 1. Amazon SES

    Amazon Simple Email Service (SES) is the most affordable and reliable SMTP service provider fro sending transactional and marketing emails. It costs $1 for 10,000 emails. It is ideal for sending high volume emails. Some of the big tech companies that use it include Netflix, Duolingo, Reddit, etc.

  2. 2. SendGrid (Twilio)

    SendGrid (now Twilio) is the best SMTP service provider if you need more email delivery features that Amazon SES does not support. It costs $19.95/mo for 50,000 emails sent.

  3. 3. Elastic Email

    Elastic Email SMTP costs $19 a month for up to 50,000 emails. It has unique email delivery features not supported by Amazon SES, like sending analytics, email template gallery, etc.

  4. 4. Mailgun

    You can use Mailgun to deliver transaction emails using their RESTful APIs and SMTP relay. The basic plan costs $15 a month for 10,000 emails.

  5. 5. SMTP2GO

    SMTP2GO adds to the list of reliable SMTP service providers available for selection. Email delivery prices start at $15 a month for 10,000 emails. It also has SMS messaging.

  6. 6. Postmark

    You can use Postmark SMTP API to deliver emails from your app. It costs $15 a month for 10k emails. It has delivery, bounce, spam, and open rates metrics. You can also enable link tracking to monitor link click stats.