Email tools

Email aliases that forward with PGP encryption and replies, plus an API and CLI.

• Open source

Email alias forwarding that hides your real address.

• Open source

Validation API for email addresses, IP addresses and phone numbers.

• No card

Mailbox hosting for AI agents: create inboxes by API and send or receive over JMAP.

Email addresses that collect newsletters into a separate reading inbox.

Throwaway address generator that hides your real inbox when signing up for sites.

DMARC report monitoring with alerts on DNS record changes and IP threat data.

• No card

Disposable address detection for signup forms, also usable as a single-email check.

• No card

DMARC aggregate report analysis that labels senders and checks SPF/DKIM alignment.

• No card

Mailbox hosting on your own domain with IMAP, POP3 and SMTP access.

Guided DMARC rollout that walks a domain toward an enforcing anti-spoofing policy.

Validation API that flags throwaway addresses, misspelled domains and missing MX records.

Address verification API that checks whether an email is valid and deliverable.

Open forwarding service routing mail from custom-domain aliases to an existing inbox.

Sandbox mail server for checking app emails in QA and CI pipelines without real delivery.

Chrome extension creating short-lived inboxes for walking through signup flows.

Self-hostable throwaway inbox where received messages are removed after a few days.

• Open source

Lookup API for spotting and rejecting disposable addresses at signup.

• No card

Custom-domain forwarding with ARC and DKIM signing, plus webhooks for incoming mail.

Deliverability test that reviews a sent message and the domain's DNS authentication records.

API for spotting temporary addresses so they can be refused at registration.

Disposable inbox API for tests, with outbound capture and relays to Slack, websockets or webhooks.

Sending API and SMTP alongside marketing campaigns and a sandbox inbox for testing.

Alias service collecting many addresses into one mailbox on your own domain.

Bulk list cleaner that checks addresses for validity before you send.

• No sign-up

Encrypted personal mailbox with end-to-end protection between Proton users.

Inbox-address deliverability test covering authentication, spam scoring, blocklists and rDNS.

• No sign-up

Signup screening API scoring the email, phone number and IP of new registrations.

• No card

Alias forwarding that shields your real address, with replies sent back through the alias.

• Open source

Dashboard for reading DMARC reports and tracking which sources mail for a domain.

Checker that tells whether an address belongs to a temporary mail provider.

Encrypted mailbox and calendar with no ads or tracking, partly open source.

Verification API confirming mailboxes exist and flagging disposable providers.

Address verification by API or bulk list upload.

Hosted business mailboxes on your own domain with webmail and mobile apps.

Disposable inbox that expires after a short time, handy for test signups.

• No sign-up

Test SMTP server that captures outgoing mail from development apps for inspection.

Send-a-message checker that reports on a domain's SPF, DKIM and DMARC setup.

Deliverability checker scoring content, links and setup, plus inbox placement across providers.

• No card
• No sign-up

Domain mail setup audit that rates SPF, DKIM, DMARC and server config on a 100-point scale.

• No sign-up

Fake SMTP inbox that accepts test messages and never delivers them, built for Nodemailer.

Forwarding service that routes mail sent to a custom domain into an existing inbox.

Checker for a domain's support of modern standards: IPv6, DNSSEC, HTTPS, DANE and mail security.

Domain audit of mail authentication records, DNSSEC and blocklists, with AI fix advice.

• No sign-up

Local SMTP catcher that shows intercepted messages in a browser UI.

• No sign-up

Public throwaway mail where any inbox name works instantly, handy for quick tests.

• No sign-up

Throwaway inbox generator supporting several addresses at once and forwarding.

Disposable address generator that issues a new inbox on each page load.

Throwaway forwarding addresses that expire automatically after a set time.

Business app suite with no-cost plans for mail, docs, chat, projects, billing, forms and more.