Email does not work after deployment

I have tried Mailgun, Sendgrid, and SMTP (from Sendgrid). All of these options send email just fine on my local machine. Once I deploy to Fly.io, no emails get sent.

I have ensured all server environment variables are set through Fly.io secrets. I have verified they are there. I have re-deployed many times after setting the secrets. Nothing seems to have any effect whatsoever.

I get no errors from the client side, and no network errors.

What am I missing?
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