Headless Form Solutions
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Verge3D for WordPress allows sending forms via email. See here for more info.
Cloud-Based
Getform.io - https://getform.io/
OpenformStack - https://openformstack.com/
Web3Forms - https://web3forms.com/
Headlessforms - https://www.headlessforms.cloud
Self-Hosted
MailBear https://github.com/DenBeke/mailbear