More flexible parsing options and a stricter default

[eternal-flame-AD]

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Fixes #80. Fixes #31. Fixes #21. Fixes #11.

Changes:

• Moved the main parsing function to a more stricter one with a sensible default that should cover the typical usage (web submissions). I left "isEmail" alone as the function name never implied it does any sanitation.
• Fixed a potential SMTP command injection.

I can't get two tests to pass even without modifications, maybe the email domain used in the test changed their configuration?