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Best Email APIs in 2026

  1. 1

    e2a

    Free plan APISelf-hostedWeb
    7.5 Free plan · paid from $10/mo Visit site
  2. 2

    Hyvor Relay

    by Hyvor Relay
    Free plan APISelf-hostedWeb

    Choose Hyvor Relay if you need a developer-focused email API with self-hosting, automation, and delivery event reporting.

    7.4 Free plan · paid from €30/mo Visit site
  3. 3

    CloudMailin

    Free plan APIWeb

    CloudMailin handles inbound email delivery as well as transactional outbound email. The Free plan has message-size limits, and paid plans start at $25 a month.

    7.3 Free plan · paid from $25/mo · 7-day trial Visit site
  4. 4

    MailerSend

    Free plan APIiPhoneWeb

    MailerSend combines transactional sending with tools for templates, monitoring and inbound reply handling. Review the Free plan and trial limits, and note that the mobile app is iOS-only.

    7.3 Free plan · paid from $7/mo · 14-day trial Visit site
  5. 5

    Emailit

    Free plan APIWeb

    Emailit brings campaign tools, transactional delivery, inbound routing, integrations, and security controls together.

    7.2 From $20 Visit site
  6. 6

    Mailazy

    Free plan APIWeb

    Mailazy combines newsletter creation, contact grouping, automation, and developer-facing delivery tools in one service.

    7.2 Free plan · paid from $100/mo · 14-day trial Visit site
  7. 7

    Maileroo

    by Maileroo
    Free plan APIWeb

    Maileroo combines sending, inbound handling, testing and delivery analytics in web and API access. Review the monthly and hourly limits against your sending needs before choosing a plan.

    7.2 Free plan Visit site
  8. 8

    MailKite Server

    Free plan APISelf-hostedWeb
    7.2 Free plan Visit site
  9. 9

    Elastic Email

    Free plan Web

    Elastic Email brings campaign automation, audience organization, landing pages, and testing into one web service.

    7.1 Free plan · paid from $29/mo Visit site
  10. 10

    Mailjet

    by Mailjet
    Free plan APIWeb

    Choose Mailjet for combined marketing and transactional email, with automation, developer sending tools, and team collaboration in one platform.

    7.1 Free plan · 30-day trial Visit site
  11. 11

    MailPace

    Free plan APIWeb
    7.1 Visit site
  12. 12

    OpenSend

    Free plan APISelf-hostedWeb
    7.1 Free plan · paid from $10/mo Visit site
  13. 13

    Plunk

    Free plan APISelf-hostedWeb

    Choose Plunk if you want transactional email, campaigns and event-based workflows in one platform, with API, SMTP and self-hosting options.

    7.1 Free plan · paid from $0.00 Visit site
  14. 14

    Mailtrap Email Sending

    Free plan APIWeb
    7.0 Free plan · paid from $15/mo Visit site
  15. 15

    Posta

    Free plan APISelf-hostedWeb

    Choose Posta if your team can run email infrastructure and wants API sending, SMTP relay, inbound mail, templates, and webhooks in one platform.

    7.0 Open source Visit site
  16. 16

    turboSMTP

    by turboSMTP
    Free plan AndroidAPIiPhone+4

    turboSMTP combines SMTP delivery, campaign tools, and message tracking, with plans ranging from a time-limited free option to paid monthly plans.

    7.0 From €14.95/mo Visit site
  17. 17

    Netcore Email API

    Free plan API
    6.9 Free plan Visit site
  18. 18

    Postmark

    by Postmark
    Free plan APIWeb

    Postmark offers application email delivery, tracking, and inbound processing with a permanent but limited free tier.

    6.9 Free plan · paid from $15/mo Visit site
  19. 19

    Resend Broadcasts

    by Resend Broadcasts
    Free plan APIWeb

    Resend Broadcasts combines a visual editor, scheduling, contact-level tracking and API controls for campaigns to existing contacts.

    6.8 Free plan · paid from $20/mo Visit site
  20. 20

    SMTP2GO

    Free plan APIWeb

    SMTP2GO combines SMTP and API delivery with event reporting, authentication and integrations.

    6.7 Free plan · paid from $10/mo Visit site
  21. 21

    Brevo Transactional Email

    Free plan Web
    6.6 Free plan · paid from $9/mo Visit site
  22. 22

    Waypoint

    Free plan APIWeb

    Waypoint pairs an email API with visual template editing and activity logs for transactional messaging teams. Its stated exclusions and plan limits matter when matching it to a sending workflow.

    6.6 Free plan · paid from $20/mo Visit site
  23. 23

    EmailEngine

    Free trial APILinuxMac+3

    Choose EmailEngine if you need a self-hosted API for existing Gmail, Microsoft 365 or IMAP mailboxes and want control over where it runs.

    6.5 From $1,450/yr · 14-day trial Visit site
  24. 24

    Twilio SendGrid

    by Twilio SendGrid
    Free plan API

    Twilio SendGrid provides several sending interfaces, developer libraries, message tools, and delivery tracking.

    6.5 From $19.95/mo · 60-day trial Visit site
  25. 25

    Amazon SES

    Free trial APIWeb

    Amazon SES provides sending, receiving, authentication, testing, and delivery visibility in one cloud service.

    6.3 From $0.10 Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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