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This PR adds the foundations for the SMTP sender, adding it should reduce the implementation friction to use Maildoor making things a lot more easier.
While on it I came across a couple of interesting libraries to test email sending through SMTP, however given Maildoor wants to use the less dependencies as possible decided to just mock the SMTP server to avoid the dependency. Most of the code for mocking the SMTP server comes from the Go standard library and may be a hint to create a SMTP testing library.