Sending Emails from NestJs Using the Mailgun API

I had set up the mailing with nodemailer with mailgun few months back, that was working fine but I had got few recurring issues, that's why I have switched the implementation from SMTP to API, and I found it quite simpler than that of the SMTP as no extra library need to be used, apart from the request client axios.

The snippet of the implementation goes like this:

public async sendMail(mail: IMail) {
const mailOptions: MailInput = {
from: `SON <${configService.get('SENDER_EMAIL')}>`,
to: mail.to,
subject: mail.subject,
}
if (mail.template) {
const emailTemplateSource = fs.readFileSync(path.join(__dirname, `../../templates/${mail.template}.hbs`), "utf8")
const template = handlebars.compile(emailTemplateSource);
const htmlToSend = template(mail.templateVariables)
mailOptions.html = htmlToSend
} else {
mailOptions.text = mail.text;
}
try {
const body = Object.keys(mailOptions).map((key, index) => `${key}=${encodeURIComponent(mailOptions[key])}`).join('&');
const response = await axios.post(`https://api.mailgun.net/v3/${configService.get('MAILGUN_DOMAIN')}/messages`,
body,
{
auth: {
username: 'api',
password: configService.get('MAILGUN_API_KEY')
},
headers: {
"Content-Type": "application/x-www-form-urlencoded"
}
});
Logger.log(`Email successfully sent to: ${mail.to}.`)
return response;
} catch (error) {
Logger.warn(`Problem in sending email: ${error}`);
throw error;
}
}