Learn how to Ship Serverless Emails With Node.js

How to Send Serverless Emails With Node.js

If you’re working a Jamstack structure, typically you’ll require further performance like sending transactional emails to your customers. Sending emails requires a server, so you may make a easy serverless service with an endpoint that takes a couple of fields and sends off an e-mail. It’s a wonderful different that does not require the upkeep of a server.

This tutorial will construct a easy serverless service utilizing AWS Lambda, the Serverless Framework, NodeMailer, and Mailtrap for e-mail testing.


  • Nodejs
  • AWS account with IAM entry
  • Mailtrap Account

The Serverless Framework

“The Serverless Framework is a free and open-source net framework written utilizing Node.js. Serverless is the primary framework developed for constructing purposes on AWS Lambda, a serverless computing platform supplied by Amazon as part of Amazon Internet Providers.” Wikipedia

AWS IAM Consumer

AWS companies corresponding to Lambda require that you simply present credentials once you entry them. The service makes use of the credentials to find out when you’ve got the correct entry to the assets managed by the service. Nevertheless, it isn’t really useful that you simply entry any AWS service utilizing the credentials in your AWS root account consumer. As a substitute, use AWS Identification and Entry Administration (IAM) to create an IAM consumer and add the consumer to an IAM group with particular permissions.

Creating an IAM consumer

If you don’t have already got an AWS account, go to https://portal.aws.amazon.com/billing/signup and observe the directions there to create an account. There are 3 methods of making an IAM consumer:  AWS administration console, the AWS CLI, and AWS API. For this submit, we’ll present how one can create an IAM consumer by way of the administration console.

  • Register to the AWS Administration Console and open the IAM console at https://console.aws.amazon.com/iam/.
  • Click on on “Customers” within the left sidebar after which click on the “Add customers” button.
  • Enter the identify of the consumer. It will likely be the sign-in username.
  • For entry kind, choose the “programmatic entry”.  It permits an entry key ID and secret entry key for the AWS API, CLI, SDK, and different growth instruments, which we’d like for this submit.
  • Click on on the “Subsequent: Permissions” button and choose “Connect present insurance policies immediately”. Within the listing of present insurance policies, examine or select the “AdministratorAccess”. The AdministratorAccess coverage is to present the Serverless framework the power to do no matter it must do.
  • Click on on the “Subsequent: Tags”. The tags are non-obligatory, and we don’t want them for this submit, so we will skip it and click on on “Subsequent: Assessment” to overview your alternatives.
  • Subsequent, click on on “Create Consumer” and you will notice a display just like the one beneath. Pay attention to the entry key ID and secret entry key as we’ll use them in establishing the serverless software.

Organising Serverless

Now that we have now an AWS IAM consumer, we have to set up the Serverless framework and use the credentials we generate above to set it up. Open your terminal and run the command beneath.

As soon as Serverless set up is accomplished, arrange the credentials to work on the AWS account. To do that, kind within the code beneath in your terminal, changing the entry key ID and Secret entry key with the one generated from above. Save the credentials securely in LastPass or different alternate options as misplaced entry could create you extra issues sooner or later.

We’ve got used AWS as a supplier, however the Serverless framework helps a number of different AWS alternate options, be at liberty to examine & examine them too. 

Making a New Serverless Challenge

This undertaking will probably be deployed on AWS lambda, utilizing an AWS starter template to bootstrap the undertaking. Create or enter into your required undertaking listing in your terminal and run the Serverless CLI command beneath to generate a Serverless undertaking.

The --path flag specifies the undertaking folder. The undertaking will probably be initialized in your present listing if the trail flag just isn’t supplied.

The command generates two main recordsdata, the handler.js, and the serverless.yml recordsdata. The handler.js is a starter Lambda occasions handler, whereas the serverless.yml holds all of the AWS lambda useful resource configurations. Discover the perform “good day” within the listing of capabilities within the serverless.yml file. The handler is ready to “handler.good day”, which is the identify of the handler file (handler.js) dot the identify of the exported perform within the file.

Whereas configuring Serverless, we arrange a profile and can use that profile to deploy our serverless undertaking. So we have to modify the supplier config in serverless.yml to incorporate the profile.

Now you can invoke the good day perform regionally by working the command:

If all the things works properly, you must see the output beneath:

 Run the command beneath to deploy the undertaking to AWS Lambda:

The command will create a serverless config file, which is able to make a cloud formation template, which is able to construct all of the assets related to the undertaking. If all the things works tremendous, you will notice an output just like the one within the picture beneath.


Should you head over to the AWS Lambda console, you must see the newly deployed Lambda perform.


Sending Emails on Lambda

We’ll use Nodemailer to ship an e-mail. It’s an NPM bundle that helps SMTP and different e-mail instruments like AWS SES to stream emails.

“Nodemailer is a module for Node.js purposes to permit straightforward as cake e-mail sending. The undertaking received began again in 2010 when there was no sane choice to ship e-mail messages, at the moment it’s the resolution most Node.js customers flip to by default.” Nodemailer Web site

To put in an exterior library on the serverless undertaking, we have to initialize an NPM undertaking to generate the bundle.json file for dependency administration. Within the terminal, run the command beneath.

The --yes flag initializes an NPM undertaking with out the frequent questions when setting a brand new undertaking. With the bundle.json file generated, let’s go forward and set up nodemailer.

Create a brand new file, e-mail.js, and add the code beneath into the file. 

The code above is a handler for sending Nodemailer emails. Now let’s configure a brand new perform on the serverless.yml file. This perform will hearken to an AWS HTTP occasion after which set off the e-mail handler. Your serverless.yml file ought to now appear to be the one beneath.

Deploy the code once more by working

If the deployment is profitable, you will notice an output just like the one beneath. Discover the endpoints. As a result of we added an HTTP even parameter to our perform, it generated a brand new endpoint with the given path.


Copy the endpoint and use it to make a POST request on the postman.

Electronic mail Testing With Mailtrap

Electronic mail testing is crucial as a result of it helps you view and determine errors in your emails earlier than sending them to your prospects. Easy issues like damaged photographs and browser compatibility may impression the expertise of your prospects. The one approach to make sure that your customers don’t get to search out out about such points is by testing the emails earlier than sending them to your prospects.

To check emails despatched with Nodemailer, we’ll use Mailtrap, a web based e-mail sandbox service that captures SMTP server visitors from staging and dev environments. It means that you can automate your take a look at flows with a versatile API, analyze content material for spam rating and e-mail deliverability, and validate HTML/CSS. Folks additionally discover PHP contact type to handle their enterprise emails by way of managed servers, in order that they do not should take care of the server administration hassles

Create a free account, go to the SMTP settings tab in your Inbox, copy the Node.js – Nodemailer transporter config, and use it to exchange the transporter in e-mail.js.

Deploy once more and name the e-mail API by way of submit, then take a look at once more on Postman. If all the things goes properly, you must get a response just like the one within the picture beneath.

Now head over to your Mailtrap Inbox. It is best to be capable of see the brand new e-mail. Undergo every tab (HTML, HTML Supply, Textual content, Uncooked, Spam Evaluation, HTML Test, Tech Data) and ensure that all the things seems good. In any other case, implement the solutions to enhance your e-mail. Additionally, try the responsiveness tabs to make sure compatibility with varied units.


We’ve got seen how one can use the Serverless framework, AWS Lambda, sending emails with Nodemailer and Mailtrap to ship and take a look at emails. Nevertheless, we have now solely proven a couple of of what every of those instruments and applied sciences can do, be sure you try every of them to study extra about them.

We hope this tutorial will show you how to remedy the query with serverless emails and also you’ll don’t must outsource it now.

Until subsequent time!

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