implement send mail feature

[tau-bar]

Description

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Issues

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Type of change

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• New feature (non-breaking change which adds functionality)

Screenshot

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Steps to test

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have ran yarn lint and yarn build without any warnings