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Best Email APIs in 2026

Email APIs let software send and receive email through an API or related services. This list is for people comparing hosted and self-hosted options on a budget.

31 apps
Research read 23 Sept 2026
How the order is worked out

1

e2a

Free plan APISelf-hostedWeb

7.5 Free plan · paid from $10/mo Visit site
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

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

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

Emailit

Free plan APIWeb

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

7.2 From $20 Visit site
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

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

MailKite Server

Free plan APISelf-hostedWeb

7.2 Free plan Visit site
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

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

MailPace

Free plan APIWeb

7.1 Visit site
12

OpenSend

Free plan APISelf-hostedWeb

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

Mailtrap Email Sending

Free plan APIWeb

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

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

Netcore Email API

Free plan API

6.9 Free plan Visit site
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

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

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

Brevo Transactional Email

Free plan Web

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

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

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

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

Compare free plans, trial periods, paid starting prices and monthly send limits. Check inbound email, delivery event webhooks, SMTP relay, templates, dedicated IP options, supported platforms and licence terms if you need to read or change code.

Questions

Do Email APIs have free plans?

A free plan is offered by items in this category. Check the plan's monthly send limit and features before relying on it.

Can I try an Email API before paying?

A free trial is offered by items in this category. Trial length and terms differ, so check the listing and provider details.

What features should I compare?

Compare free plan, paid-from price, monthly send limit, inbound email, delivery event webhooks, SMTP relay, templates and dedicated IP options.

Which platforms do these Email APIs support?

Platforms listed for this category include API, web, self-hosted, macOS, iOS and Linux. Check the individual tool for its supported setup.

Can an Email API provide inbound email?

Inbound email is a comparison point for this category. Check whether the tool supports receiving messages before choosing it.

Questions

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