SMTP server using hmailserver. Host cannot be resolved to a type

I am trying to create a local SMTP server. I configured everything according to this: Link to set-up hmailserver

After that, I ran my diagnostics thing and it said host(in my case, [email protected]) cannot be resolved. I googled and read the documentation and question section of hmailserver Docs and found that I am missing a DNS configuration on my machine.

I followed this article to set-up the DNS ip to name: How to add ip domain mapping in windows

127.0.0.1 bufferoverflow.com

on my

C:\Windows\System32\drivers\etc>notepad hosts.ics

It still said host cannot be resolved to a type. I tried to see if the port was actually open and listening. So I did this command in CMD:

netstat -a

It's listening. I doubled checked everything but coudn't found where I was going wrong. I created a simple nodejs server and hosted it on port 80 at localhost and typed "bufferoverflow.com" in my browser it opened 127.0.0.1 aka localhost which is because it has an ip domain mapping I have given.

Now I am lost as why the hostname can't be resolved. My DNS is cool. Everthing is configured as docs says and the port is also open and listening. Please help me.

Solution

So based on what you said you created your own SMTP server which is nice and all to learn, but I would recommend using SendinBlue 3rd party service FREE and gives you 300 mails/day

Getting Started with sendinblue:

Link: https://www.sendinblue.com/
Go make and an account free of charge till you decide to pay you'll read there
Once your account is all set, and activated often SMTP service for ones account is not automatically activate so you'd have to email them and they literally respond within 24hr I LOVE THE SERVICE(I am not promoting nor sponsored to hype them or anything just saying the truth of what I have experienced).

So now at this point your account and SMTP service is activated, now question is how do you use sendinBlue?

In your dashboard on your Top right you will see your username
Click on that and a dropdown menu should appear
Then you want to go to SMTP & API
Once you then you will see a menu with API Keys on the left and SMTP on the right
You want to click on the SMTP.
Once you the you will see Login that would be the email you registered with and you will see Master password now that is what you use to authenticate yourself.

Implementation: Now you have everything sorted you know where you keys are and login

In .env file

sendinBlue__login=<Your email that your saw in that smtp tab>
sendinBlue__key= <Key you saw in that smtp tab>

In your file where you want to send email

const nodemailer = require('nodemailer');
router.post('/api/email', (request, response)=>{

   const transporter = nodemailer.createTransport({

       service:'SendinBlue',
       auth:{
           user:process.env.sendinBlue__login,
           pass:process.env.sendinBlue__key
       }

   })


   const mailOptions = {
       from:process.env.sendinBlue__login
       to:'[email protected]',
       subject:'Order confirmation',
       html:`

           <h1>Confirmation of your received  order</h1>

       `
 
   }


   transporter.sendMail(mailOptions, (error, info)=>{

       if (error){
           console.log(error);
           return response.status(500).json({msg:"Email failed to send probably network problems or SMTP not activated"});

       }
       return reponse.status(200).json({msg:'Email sent'});

   })

})

Now this is how easy sendinBlue works just simple signup and account activation also SMTP activation if not activated from get go by email customer support

If that guide above did not make sense to you: Shameless plug

You can go checkout my video that I did and I was using sendinBlue with nodemailer for emailing it's a bit at the end
Link: https://youtu.be/5vWXbGIdDQw

Now If you want to send an email using [email protected] with sendinBlue you do not even have to have the email activated but still can send

How you go about this is the way you craft your mailOptions

router.get("/api/test", (request, response) => {
  const transpoter = nodemailer.createTransport({
    service: "SendinBlue",
    auth: {
      user: process.env.sendinBlue__email,
      pass: process.env.sendinBlue__key,
    },
  });

  const mailOptions = {
    from: "[email protected]",
    to: "[email protected]",
    subject: "Confirmation Order",
    html: `
       
       <h1>Order Received</h1>
    
    `,
  };

  transpoter.sendMail(mailOptions, (err, info) => {
    if (err) {
      return console.log(err);
    }
    return console.log("Message sent");
  });
});

See on my mailOptions I explicitly wrote myself the email that I want and when sendinBlue sends that email the receiver will see that is coming from [email protected]