Daniel Strunk

Configure Vagrant to test emails

This walkthrough assumes you have a Gmail account. If you are using another email provider that utilizes SMTP, skip to the bottom of this tutorial for a list of files that will need to be updated with your provider’s SMTP information.

Occasionally you might need to test PHP email functionality from your local development environment; if that’s the case, this is for you.

First up, I created a shell script that quickly sets up a Vagrant Ubuntu box with Postfix; this script downloads and updates CA Certificates, installs Postfix and all required dependencies, updates the Postfix configuration, and finally reloads the service:

{% gist ff6301609bdbbcb3057d27812f8630e6 %}

Let’s get started

First thing’s first: let’s create an application password for Gmail. Follow the steps below:

  1. Visit your App passwords page.
  2. At the bottom, click Select app and choose the app you’re using.
  3. Click Select device and choose the device you’re using.
  4. Select Generate.
  5. Follow the instructions to enter the App password (the 16 character code in the yellow bar) on your device.
  6. Select Done.

Once you are finished, you won’t see that App password again. However, you will see a list of apps and devices you’ve created App passwords for.

Now that you’ve got an applciation-specific password, SSH into your VM. From your VM’s directory, run this command:

vagrant ssh

Now that you’re in the VM, edit /etc/postfix/sasl_passwd by running following command:

sudo vim /etc/postfix/sasl_passwd

The file contains one line: the SMTP information for Gmail, and a placeholder for your gmail address and application-specific password. Input these now (formatted as such: [email protected]:password), then save the file.

After saving the file, run the below command:

sudo /etc/init.d/postfix reload

Now, you should be good to go! If you’d like to test sending out an email, you can run the below command:

echo "it works!" | mail -s "Test email from Vagrant" [email protected]

You should receive an email in short order.


I don’t use Gmail; what should I do?

As long as your email provider has SMTP support, updating your Postfix config is relatively straightforward. Googling for ’[your-email-provider] smtp’ should yield their address and port number needed (e.g., a quick Google search for Yahoo’s information yielded smtp.mail.yahoo.com and port 465).

From there, you will need to edit /etc/postfix/main.cf and /etc/postfix/sasl_passwd. In main.cf you’re looking for the line containing relayhost. You will update this line to have your email client’s SMTP settings within the square brackets, and the port after the colon (e.g. [smtp.mail.yahoo.com]:465).

In /etc/postfix/sasl_passwd you will need to do the same thing.

Also of note when working with a non-Gmail account: you might not have the ability to create application-specific passwords. So, you’ll need to put your actual email password inside /etc/postfix/sasl_passwd.

How about using an external mail provider (Mailgun, Mandrill, etc.)?

Go for it! If that’s the case, you don’t need this at all. You will, however, need an understanding of your respective email provider’s API, as well as how to integrate this API into whatever you’re building. Please see their documentation for more details.

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