Communication·Standings
Compare Email APIs
Email APIs let software send and receive email through a service; the choice depends on the connections and email features you need.
Compare the monthly send limit, inbound email, delivery event webhooks, SMTP relay, templates and dedicated IP options. The board also shows a signal score out of 10 and marks for an API, open-source code and a free tier.
- 31 platforms
- 3 with a public API on this page
- 22 with a free tier
- Checked 23 Sept 2026
- 1 TturboSMTPturbosmtp.com
Email delivery service for API, web, Android, iOS, Windows, macOS, and Linux, from €14.95 monthly.
- 2 M
MailerSendmailersend.comTransactional email service with API and SMTP sending, tracking, templates, and inbound routing.
- 3 M
Mailjetmailjet.comEmail service with web and API access, a free plan, and a 30-day trial.
- 4 P
Postmarkpostmarkapp.comA transactional email service for web and API use, starting at $15 per month after its free plan.
- 5 MS
MailKite Servermailkite.devMailKite Server is an open-source email server for apps and AI agents.
- 6 RB
Resend Broadcastsresend.comA broadcast email service for web and API use, with paid plans starting at $20 per month.
- 7 TS
Twilio SendGridtwilio.comTwilio SendGrid is a cloud-based SMTP provider and email delivery engine that sends email without customers maintaining their own email servers.
- 8 HR
Hyvor Relayrelay.hyvor.comOpen-source email API with self-hosting and a limit of 300,000 monthly sends.
- 9 E
EmailEngineemailengine.appEmailEngine is a self-hosted email API that connects existing Gmail, Microsoft 365 and IMAP mailboxes through a unified REST API.
- 10 ME
Mailtrap Email Sendingmailtrap.ioEmail API and SMTP service for transactional and bulk messages, with templates and delivery statistics.
- 11 P
Postagoposta.devAn open-source email service that handles outbound mail, incoming messages, and website forms.
- 12 S
SMTP2GOsmtp2go.comAn email delivery service with SMTP, API, and web access; its free plan is available.
- 13 E
Emailitemailit.comEmail platform for transactional messages and campaigns, available through REST, SMTP, or a dashboard.
- 14 M
Maileroomaileroo.comMaileroo provides SMTP relay and Email API services for transactional and marketing emails.
- 15 MMailPacemailpace.com
MailPace is a transactional email service for sending emails such as password resets, OTP codes, and notifications.
- 16 NE
Netcore Email APInetcorecloud.comEmail service for apps and websites, with REST API, SMTP relay, and language SDKs.
- 17 C
CloudMailincloudmailin.comInbound email service that parses messages and forwards them to apps in several formats.
- 18 E
e2ae2a.devOpen-source email API with hosted and self-hosted options, SDKs, and two-way inboxes for agents.
- 19 P
Plunkuseplunk.comPlunk is an open-source email platform for transactional email, marketing campaigns, and automated workflows against one contact list.
- 20 W
Waypointusewaypoint.comAn email service with a template editor, JSON-based sending, and sandbox previews.
- 21 S
SocketLabssocketlabs.comSocketLabs describes its offering as an email delivery and analytics platform for sending, analyzing, and optimizing email.
- 22 M
Mailazymailazy.comEmail platform for campaigns, newsletters, and automated flows, with contact lists and reporting.
- 23 OOpenSendopensend.namuh.co
OpenSend describes itself as an open email infrastructure platform with a Resend-compatible API, SDK, broadcasts, contacts, and dashboard.
- 24 EE
Elastic Emailelasticemail.com - 25 Z
ZeptoMailzoho.comIts email service is built exclusively for transactional email such as verification codes and password resets.
Places #1, #2, #3, #4, #5 on this board are open to sponsors. Take #1 · Other ways to advertise
How to choose
How much email do you need to send?
Compare the monthly send limit with the amount of email your software needs to send.
Check the paid-from price alongside the free-plan mark, so you can weigh the listed starting price against the plan details.
Does it need to receive email too?
Choose a service with inbound email if your software needs to receive messages, not just send them.
Check the delivery event webhook field if you need email delivery events to be sent back to your software.
How does it connect to your software?
Compare the API and SMTP relay fields with the way your software connects to email services. SMTP relay is a way to pass outgoing email through a service.
The platform marks show whether a service is listed for API, web, self-hosted, macOS, iOS or Linux.
Do you need templates or a dedicated IP?
Check the email templates field if you want to prepare reusable email layouts, and the dedicated IP option if that matters for your setup.
Can you try it before paying?
Look for a free-plan mark or a free trial, then compare the paid-from price. The board lists these separately because a free plan and a trial are different offers.
Questions
What is an email API used for?
It lets software send or receive email through a service. Compare sending limits, inbound email and the connection options shown on the board.
What is the difference between a free plan and a free trial?
A free plan is listed separately from a free trial. Check the plan and trial marks to see which offer a service provides.
What does SMTP relay mean?
SMTP relay passes outgoing email through an email service. Check the SMTP relay field if your software needs that connection.
What is a delivery event webhook?
It sends delivery event information back to software. Compare the webhook field if your system needs those events.
Which platforms do email APIs support?
The platform marks cover API, web, self-hosted, macOS, iOS and Linux. Check a service's marks against where your software needs to run.
Some top positions on this board can be paid placements, standing where they were sold. The facts on each platform are not for sale. How we rank · Disclosure