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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I like https://github.com/postalserver/postal which is an open source smtp server on the same lines as mailgun and sendgrid. Just remember hosting your own mail server can be tricky as deliverability is also linked to the ip the host provides you, and the reputation of the data center, etc.
Maybe this helps. https://github.com/comakingspace/contact_server
Mailrise?
What about https://github.com/postalsys/emailengine ?
I have made a pretty handy SMTP sender for Python if the language is a bit familiar (the lib is extremely easy to use): https://github.com/Miksus/red-mail