Self-hosted Sentry ships with a built-in outgoing SMTP server powered by exim4. The default configuration is set to use this server. All you need to do is to set a valid address for
mail.from setting in
config.yml . Keep in mind that if you start sending too many emails to public addresses, your new server may get marked as a spammer and banned.
If you want to use an external SMTP server you can set the relevant
mail.* settings in
config.yml file and ignore the built-in SMTP server. Refer to our email service documentation for all the details on what each setting means and does.