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422 on force send

See original GitHub issue

Describe the bug I am getting a 422 error in the terminal when I force send.

I am also getting the following error popup:

This is my API route that triggers the sending of the email

//api/sendTestEmail.tsx
import sendMail from "emails";
import ConfirmEmail from "emails/ConfirmEmail";

export default async function handler(req: any, res: any) {

  sendMail({
      subject: "First Test Email",
      to: "personalEmail@hidden.com",
      component: <ConfirmEmail firstName="Amelita" ctaText={"Verify this test email"} callbackUrl={"https://callbackUrl.com/"} />
    });
  }

This is the my emails/index.ts

import nodemailer from "nodemailer";
import { buildSendMail } from "mailing-core";

const transport = nodemailer.createTransport({
  pool: true,
  host: "smtp.postmarkapp.com",
  port: 587,
  secure: true, // use TLS
  auth: {
    user: process.env.POSTMARK_CLIENT,
    pass: process.env.POSTMARK_CLIENT,
  },
});

const sendMail = buildSendMail({
  transport,
  defaultFrom: "workEmail@hidden.com",
  configPath: "./mailing.config.json",
});

export default sendMail;

Finally, this is the preview output

mailing 💌 opening sendMail preview {
  subject: 'First Test Email',
  to: 'personalEmail@hidden.com',
  component: {
    '$$typeof': Symbol(react.element),
    type: [Function: ConfirmEmail],
    key: null,
    ref: null,
    props: {
      firstName: 'Amelita',
      ctaText: 'Verify this test email',
      callbackUrl: 'https://callbackUrl.com/'
    },
    _owner: null,
    _store: {}
  },
  html: 'omitted'
}
API resolved without sending a response for /api/sendTestEmail, this may result in stalled requests.
mailing 💌 opening sendMail preview {
  subject: 'First Test Email',
  to: 'personalEmail@hidden.com',
  component: {
    '$$typeof': Symbol(react.element),
    type: [Function: ConfirmEmail],
    key: null,
    ref: null,
    props: {
      firstName: 'Amelita',
      ctaText: 'Verify this test email',
      callbackUrl: 'https://callbackUrl.com/'
    },
    _owner: null,
    _store: {}
  },
  html: 'omitted'
}