I've had good results by asking users to spell their email character-by-character, then repeating it back for confirmation before saving. For Spanish, it's also helpful to normalize common pronunciations (e.g., "guion bajo" = underscore, "punto" = dot) and use a validation step that reads the email back slowly. If you'd like, I can help optimize your Deepgram Flux prompt and email capture flow to improve accuracy.
@Joseph_