Glad you solved your issues. Guessing you enabled recaptcha without adding your keys lol.
Anyway regarding mail. Gmail sucks. There rate limits blow. Def won't be able to do open reg. However to use gmail you also need to go in your gmail settings and allow less secure apps in the gmail settings so third party app can use it IE: UNIT3D.
I however though strongly recommend sendgrid.
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Founder Of UNIT3D 
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