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MailGun ECONNRESET Error

Dear all,

I’m facing an error with Maigun in a Netlify function. Everything works great in local, but when in production the mailing system is very inconsistent. Currently is Mailgun is not sending any email, but yesterday it was working.

The error in the Netlify Function Console is

11:35:00 AM: a81136dc INFO   error:  Error: Client network socket disconnected before secure TLS connection was established
    at connResetException (internal/errors.js:609:14)
    at TLSSocket.onConnectEnd (_tls_wrap.js:1549:19)
    at Object.onceWrapper (events.js:420:28)
    at TLSSocket.emit (events.js:326:22)
    at endReadableNT (_stream_readable.js:1241:12)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  code: 'ECONNRESET',
  path: null,
  host: 'api.eu.mailgun.net',
  port: 443,
  localAddress: undefined
}

And the code of the function is:


const apiKey = '*xxxxxxxxxx*';
const domain = '*xxxxxxxxxxx*';

const mailgun = require('mailgun-js')({ apiKey, domain, host: "api.eu.mailgun.net" });

exports.handler = async (event, context) => {
  try {
    const body = JSON.parse(event.body)

    const confirmationMailgun = body.confirmationMailgun;
    const confirmationSubject = body.confirmationSubject;

    const userName = body.userName;
    const userEmail = body.userEmail;
    const userPhone = body.userPhone;
    const userMessage = body.userMessage;


    if (event.httpMethod!='POST' || !event.body) {
      return new Error('An error occurred!')
    }


    // ----------------------------------------
    // NOTIFICATION: email sent to organization
    // ----------------------------------------

    const notificationVariables = {
      userName,
      userEmail,
      userPhone,
      userMessage,
    };

    // Add Notification Data
    let notificationEmail = {
        from: `${userName} <${userEmail}>`,
        to: "hello@*xxxxxxxxxxxx*.com",
        template: notificationMailgun,
        subject: notificationSubject,
        "h:X-Mailgun-Variables": JSON.stringify(notificationVariables)
    }

    // Send Notification Email
    await mailgun.messages().send(notificationEmail, function (error) {
      if (error) {
        console.log('error:', error)
        return error;
      } else {
        return {
          statusCode: 200,
          body: 'success'
        };
      }
    });

     // ----------------------------------------
    // CONFIRMATION: email sent to organization
    // ----------------------------------------

    const confirmationVariables = {
      userName,
      userEmail,
      userPhone,
      userMessage,
    };

    // Add Notification Data
    let confirmationEmail = {
        from: "hello@*xxxxxxxxxxxx*.com",
        to: `${userName} <${userEmail}>`,
        template: confirmationMailgun,
        subject: confirmationSubject,
        "h:X-Mailgun-Variables": JSON.stringify(confirmationVariables)
    }

    // Send Notification Email
    await mailgun.messages().send(confirmationEmail, function (error) {
      if (error) {
        console.log('error:', error)
        return error;
      } else {
        return {
          statusCode: 200,
          body: 'success'
        };
      }
    });


    return { statusCode: 200, body: JSON.stringify({ message: 'Email Sent' }) };
  } catch (err) {
    console.error('Final Error:', err);
  }
}

Thanks for your help!

Hey there! Sounds like this may be related to a timeout. Any chance you can share the site name (or its app ID) and any x-nf-request-ids for the function invocations?

Hey there, thanks for the additional information!

I don’t have much experience with the library however there’s a couple of similar issues over on its repo, namely this one, which hopefully may help?

Failing that, we have a few good examples out in the wild, like this one – I’d suggest trying to send a single email first to prove the concept :slight_smile: