Sites and apps similar to Mailgun include useSend, which is open source with a free version. Other options are NexusProMail, SendPulse, Sendgrid and SendFleet. You're spoiled for choice with Email Marketing Services like Mailgun: we list more than 50 alternatives for self-hosting, Windows, iPhone, iPad and Mac.
Flowmailer focusses on your inbox success. Easily connect all your source systems via SMTP or REST API and let Flowmailer deliver all your transactional emails. Sent via clean IP addresses, authenticated with SPF, DKIM, and DMARC to ensure your domain acquires a high reputation.
Cuttlefish offers basic bounce email handling, ensuring you maintain your good mail reputation by not resending to bounced addresses.
Bottled gives a domain you already own real email without standing up a mail server or paying per seat for a full office suite. You point the domain at Bottled, create addresses on it, and get a web inbox, forwarding to any existing inbox, auto-reply, and contacts.
United Kingdom
The email automation your AI runs: mailboxes, transactional email and marketing automation that ChatGPT or Claude operate through MCP and a REST API.
AgentiSend is a transactional email API for AI agents: send receipts, password resets, sign-in codes and alerts from your own verified domain, with a message log, spend budgets, a free preflight and refusals that name the fix.
The Email Service For Developers. With SMTPeter you don't have to worry about complex things like DKIM signing, SPF, DNS hosting, DMARC or tracking clicks and opens. You can easily send your messages to SMTPeter using REST or SMTP.
Netherlands
EU
InboxRoad is a trustworthy expert in email deliverability. If you would like your emails to reach the inbox of your customers, we are there for you! We are a SMTP relay service able to connect to many email campaign systems.
Open source email marketing platform with a visual MJML editor, automations, transactional API and cookieless web analytics. Self-host it and bring your own email provider.
FranceEU
Affordable Email Marketing Platform for Agencies and High Volume Senders. Built-in brand management, unlimited user accounts, lists, templates, and more. Bulk + automation/drip + transactional campaigns at single price point. Free <5k email contacts.
United States
SMTPGET is best email marketing company which offers bulk email marketing services with SMTP server and dedicated mass mailer in an affordable price range with fastest and secure hosting.
A simple API and Dashboard to manage and optimize emails sent by your application to your customers.
PostStack is a developer-first transactional email API for European teams. Send via REST or SMTP, host IMAP/POP3 mailboxes on your own domains, and run broadcasts — all from EU infrastructure with transparent pricing from €5/mo.
DenmarkEU
Canada
