Can I send emails from a sandbox?
Native email sending is disabled on our sandbox sites.
You may, of course, install mail sending and mail logging plugins that use a third-party service (like MailGun or SendGrid) to send emails.
A simple mail logger plugin installed into your sandbox can suffice if you only need to capture the text of emails for debugging purposes.
Why don’t we allow emails to be sent from the sandboxes? Because scammers & spammers ruin everything. This is why we can’t have nice things.
Sigh.