Email

Unitpost

AI-First Transactional & Marketing Email Service. Free tier: 5,000 emails/mo, 200 emails/day, 10,000 contacts, 5 domains. No credit card required. SDKs, MCP and REST API available.

https://www.unitpost.com/

10minutemail

Free, temporary email for testing.

https://10minutemail.com

AhaSend

Transactional email service, free for 1000 emails per month, with unlimited domains, team members, webhooks and message routes in the free plan.

https://ahasend.com

AnonAddy

Open-source anonymous email forwarding, create unlimited email aliases for free

https://anonaddy.com

anon.li Alias

Open source, anonymous email alias/forwarding solution with PGP encryption, reply capability, 10 random & 1 custom alias on the free plan with developer API & CLI.

https://anon.li/alias

Antideo

10 API requests per hour for email verification, IP, and phone number validation in the free tier. No Credit Cards are required.

https://www.antideo.com

Anypost

transactional and broadcast email API. 3,000 emails/month free, then as low as 8¢ per 1k

https://anypost.com

Atomic Mail

Email built for AI agents, entirely free. Programmatic inbox creation, custom domains, and full send/receive over the open JMAP standard (RFC 8620/8621); hosted MCP server available. A real mailbox service, not disposable/temporary email.

https://atomicmail.ai

Brevo

9,000 emails/month, 300 emails/day free

https://www.brevo.com/

Bump

Free 10 Bump email addresses, one custom domain

https://bump.email/

Burnermail

Free 5 Burner Email Addresses, 1 Mailbox, 7-day Mailbox History

https://burnermail.io/

Buttondown

Newsletter service. Up to 100 subscribers free

https://buttondown.email/

Canny Pigeons

DMARC monitoring platform with DNS drift alerts, IP threat intel and unlimited users. First domain is free - no credit card required.

https://cannypigeons.com/

Conduit

Turn incoming emails into webhooks to trigger your API from emails. The service is completely free.

https://conduit.email/

Contact.do

Contact form in a link (bitly for contact forms)

https://contact.do/

debugmail.io

Easy to use testing mail server for developers

https://debugmail.io/

dkimvalidator.com

Test if the email's DNS/SPF/DKIM/DMARC settings are correct, free service by roundsphere.com

https://dkimvalidator.com/

DNSExit

Up to 2 Email addresses under your domain for free with 100MB of storage space. IMAP, POP3, SMTP, SPF/DKIM support.

https://dnsexit.com/

Email Spam Tester

Tests the technical part, content, link authority and overall score of your email. Also tests where your email will land: inbox, spam or promotions. Inbox tests on Gmail, GMX, Yahoo, AOL and other email providers. Free to use, no card or registration required. Also works via API and MCP.

https://email-spam-tester.com/

EmailGuard

Block disposable emails, catch typos, and validate MX records via a simple API. 100 free requests/month.

https://emailguard.lazrek.com/

EmailJS

This is not an entire email server; this is just an email client that you can use to send emails right from the client without exposing your credentials, the free tier has 200 monthly requests, 2 email templates, Requests up to 50Kb, Limited contacts history.

https://www.emailjs.com/

EmailLabs.io

Send up to 9,000 Emails for free every month, up to 300 emails daily.

https://emaillabs.io/en

EmailQo Email Infrastructure Grader

Free email infrastructure grader that checks SPF, DKIM, DMARC and mail server configuration. Scores any domain out of 100. No signup required.

https://emailqo.com/email-grader

EmailOctopus

Up to 2,500 subscribers and 10,000 emails per month free

https://emailoctopus.com

Emailvalidation.io

100 free email verifications per month

https://emailvalidation.io

Emitlo

free 12,000 emails/month, Email API and SMTP, SPF/DKIM/DMARC support, No Credit Cards are required.

https://emitlo.com

EtherealMail

Ethereal is a fake SMTP service, mainly aimed at Nodemailer and EmailEngine users (but not limited to). It's an entirely free anti-transactional email service where messages never get delivered.

https://ethereal.email

forwardemail.net

Free email forwarding for custom domains. Create and forward an unlimited amount of email addresses with your domain name (note: You must pay if you use .casa, .cf, .click, .email, .fit, .ga, .gdn, .gq, .lat, .loan, .london, .men, .ml, .pl, .rest, .ru, .tk, .top, .work TLDs due to spam)

https://forwardemail.net

Imitate Email

Sandbox Email Server for testing email functionality across build/qa and ci/cd. Free accounts get 15 emails a day forever.

https://imitate.email

ImprovMX

Free email forwarding.

https://improvmx.com

Inboxes App

Create up to 3 temporary emails a day, then delete them when you're done from within a handy Chrome extension. Perfect for testing signup flows.

https://inboxesapp.com

inboxkitten.com

Free temporary/disposable email inbox, with up to 3-day email auto-deletes. Open source and can be self-hosted.

https://inboxkitten.com/

Is It Disposable

Detect and block disposable email addresses. Free plan of 250 lookups a month and no card required.

https://isitdisposable.com/

KaiMail

Email forwarding for custom domains with ARC/DKIM signing. Free plan includes 1 domain, 1 mailbox, 300 emails/month, and up to 1MB message size. Email receiving webhook also available. Special plans for open-source projects.

https://kaimail.net

mail-tester.com

Test if the email's DNS/SPF/DKIM/DMARC settings are correct, 20 free/month.

https://www.mail-tester.com

Maileroo

SMTP relay and email API for developers. 5,000 emails per month, unlimited domains, free email verification, blacklist monitoring, mail tester and more.

https://maileroo.com

mailcatcher.me

Catches mail and serves it through a web interface.

https://mailcatcher.me/

mailchannels.com

Email API with REST API and SMTP integrations, free for upto 3,000 emails/month.

https://www.mailchannels.com

Mailcheck.ai

Prevent users to sign up with temporary email addresses, 120 requests/hour (~86,400 per month)

https://www.mailcheck.ai/

Maildroppa

Up to 100 subscribers and unlimited emails as well as automations for free.

https://maildroppa.com

MailerLite.com

1,000 subscribers/month, 12,000 emails/month free

https://www.mailerlite.com

MailerSend.com

Email API, SMTP, 500 emails/month free for transactional emails, 100 API requests/day

https://www.mailersend.com

mailinator.com

Free, public email system where you can use any inbox you want

https://www.mailinator.com/

Mailjet

6,000 emails/month free (200 emails daily sending limit)

https://www.mailjet.com/

mailsac.com

Free API for temporary email testing, free public email hosting, outbound capture, email-to-slack/websocket/webhook (1,500 monthly API limit)

https://mailsac.com

Mailtrap.io

Email API and SMTP with 4,000 emails/month free, limited to 150 emails/day. Email Marketing includes 500 contacts and 1,500 emails/month. Email Sandbox includes 50 test emails/month, one sandbox, and up to 10 stored emails.

https://mailtrap.io/

Mutant Mail

Free 10 Email IDs, 1 Domain, 1 Mailbox. Single Mailbox for All Email IDs.

https://www.mutantmail.com/

Orbisearch

Free bulk email validator, 100 validations per day, no signup required.

https://orbisearch.com

Parsio.io

Free email parser (Forward email, extract the data, send it to your server)

https://parsio.io

Plunk

3K emails/month for free

https://useplunk.com

Postmark

100 emails/month free, unlimited DMARC weekly digests.

https://postmarkapp.com/

Proton Mail

Free secure email account service provider with built-in end-to-end encryption. Free 1GB storage.

https://proton.me/mail

Reloop

Transactional email API and SMTP for developers. Free plan: 3,000 emails/month, 200 emails/day, one custom domain and one agent inbox.

https://reloop.sh

Resend

Transactional emails API for developers. 3,000 emails/month, 100 emails/day free, one custom domain.

https://resend.com

SendBridge Mail Tester

Free email deliverability test with no signup. Generates a unique inbox address, then analyzes SPF, DKIM, DMARC, Rspamd spam score, 23+ RBL blacklists, reverse DNS, and content quality. Unlimited tests, results in seconds, shareable report pages.

https://sendbridge.com/mail-tester

Sender

Up to 15,000 emails/month, up to 2,500 subscribers

https://www.sender.net

Sendpulse

500 subscribers/month, 15,000 emails/month free

https://sendpulse.com

SendRaven

SendRaven provides an email API for transactional email and agent-driven conversations, including inbound replies and threads. The free tier includes 3,000 outbound emails per month, unlimited contacts and inbound replies, card is required.

https://sendraven.ai

SendStreak

Email framework as a service, that adds templates, automations, history, etc to your own SMTP server (E.g. AWS, Maileroo, Gmail). Free up to 100 emails/day, no time limit.

https://www.sendstreak.com/

SimpleLogin

Open source, self-hostable email alias/forwarding solution. Free 10 Aliases, unlimited bandwidth, unlimited reply/send. Free for educational staff (student, researcher, etc.).

https://simplelogin.io/

SMTPfast

SMTPfast is a simple email API for developers with a free tier that includes 3,000 emails/month, 1 domain, and 1,000 contacts, with no credit card required.

https://smtpfa.st/

Substack

Unlimited free newsletter service. Start paying when you charge for it.

https://substack.com

Suped

A user-friendly DMARC monitoring platform. The free plan covers one domain with up to 1,000 emails per month.

https://www.suped.com/

Sweego

European transactional emails API for developers. 100 emails/day free.

https://www.sweego.io/

temp-mail.io

Free disposable temporary email service with multiple emails at once and forwarding

https://temp-mail.io

Temp-Mail.org

Temporary / Disposable Mail Gen Utilizing a range variety of domain. Email Address refreshes every time the page is reloaded. It is entirely free and does not include any pricing for their services.

https://temp-mail.org/en/

TempMailDetector.com

Verify up to 200 emails a month for free and see if an email is temporary or not.

https://tempmaildetector.com/

trashmail.com

Free disposable email addresses with forwarding and automatic address expiration

https://www.trashmail.com

Tuta

Free secure email account service provider with built-in end-to-end encryption, no ads, no tracking. Free 1GB storage, one calendar (Tuta also have an paid plan.). Tuta is also partially open source, so you can self-host.

https://tuta.com/

Verifalia

Real-time email verification API with mailbox confirmation and disposable email address detector; 25 free email verifications/day.

https://verifalia.com/email-verification-api

verimail.io

Bulk and API email verification service. 100 free verifications/month

https://verimail.io/

Waitlio

Waitlist management software for product launches. Create branded waitlist pages, collect and verify email subscribers, manage signups with tags and analytics. Free plan includes 100 subscribers/month, 1 waitlist, and API access.

https://waitlio.com/

Wraps

Email infrastructure deployed to your own AWS account (SES), with a dashboard. Pay AWS directly for sending. Free plan covers 1 AWS account, unlimited domains and contacts.

https://wraps.dev

ZeroSMTP

Free SMTP relay on the msgwing.com domain, up to 200 emails/day, no paid tier. Sends from a shared @msgwing.com address only (no custom domain). Ready-to-run code examples in 15 languages plus Windows Server/Linux/network printer setup guides.

https://github.com/msgwing/ZeroSMTP