mailtrap.io

Mailtrap is a service (free plan available) that you can use to "trap" emails, without actually sending them to their intended recipient. Instead they're shown to you in a user interface.

When working on a development site, it's useful to configure emails to use such a service to prevent accidentally sending test emails to actual customers.

After creating an account, you can find the credentials in the inbox settings.

In MODX, configure the following via System > System Settings:

• mail_smtp_hosts: smtp.mailtrap.io
• mail_smtp_port: 587
• mail_smtp_user and mail_smtp_pass are provided in the inbox settings in mailtrap.
• mail_smtp_prefix: tls

Also see the generic instructions for sending email with SMTP for further activation and testing instructions