What if sending email failed?

import { betterAuth } from "better-auth"
import { emailOTP } from "better-auth/plugins"
 
export const auth = betterAuth({
    // ... other config options
    plugins: [
        emailOTP({ 
                async sendVerificationOTP({ email, otp, type}) { 
                    sendEmail(email, opt);
        }, 
        }) 
    ]
})

{
  statusCode: 403,
  message: "...",
  name: 'validation_error'
}