Implementé una función en firebase y cuando pruebo la función para enviar un correo electrónico, aparece el siguiente error:

 Error: Connection closed unexpectedly at SMTPConnection._onClose (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:824:34) at TLSSocket.SMTPConnection._onSocketClose (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:191:42) at Object.onceWrapper (events.js:520:26) at TLSSocket.emit (events.js:412:35) at TLSSocket.emit (domain.js:537:15) at net.js:686:12 at TCP.done (_tls_wrap.js:564:7) at TCP.callbackTrampoline (internal/async_hooks.js:130:17)

Esta es la función que uso para enviar el correo electrónico:

 const transporter = nodemailer.createTransport({ host: "host", port: 465, secure: true, auth: { user: "email", pass: "pass", }, }); exports.sendMailUser = functions.firestore.document("collection/Users").onUpdate(async (snapshot, context) => { const data = snapshot.after.data(); const dataReceived = data.users; const name = dataReceived[dataReceived.length - 1].name; const email = dataReceived[dataReceived.length - 1].email; const password = dataReceived[dataReceived.length - 1].password; const body = "As dori crearea unui cont pe portalul e-Radauti cu urmatoarele date: <br>" + name + "<br>" + email + "<br>" + "password" + password; const mailOptions = { from: "Adaugare User pe portal-ul e-Radauti", to: "mail", subject: "Adaugare user pe portalul e-Radauti", bcc: "bcc", html: body, }; console.log(mailOptions); await transporter.sendMail(mailOptions); return null; });

Editar: actualicé el código con la sugerencia de @Dharmaraj y también tengo el plan Blaze (Pay as you go)