listmonkManage subscriber lists and send newsletter campaigns from your server.
Free self-hosted software · hosting and SMTP delivery cost extra.
Transactional email APIs
Free alternatives to SendGrid
Find a free app for the parts of SendGrid you actually use.
Compare the free allowance and limitations on each app’s page. These are workflow alternatives, rather than identical copies.
Free options
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PostalSend application email through SMTP or an HTTP API on your own infrastructure.
100% free open-source software (GPLv3). Unlimited emails, domains, and mail servers.