Block emails being sent unless conditions are met

[CyBeRoni]

Zotonic version

0.x

Description

• Motivation
  For various reasons it is often the case that people have testing/staging environments with (semi-)live data, including user accounts with real e-mail addresses. While it is necessary to be able to test functionality involving e-mail, actually sending e-mail to real people's email addresses from such environments is unwanted.

• Proposal
  Proposed is a server-wide setting to block sending of all e-mails unless certain conditions are met. Such conditions could be:

  • The destination address matches a list (only allowing e-mails to be sent to specific e-mail addresses)
  • The destination domain matches a list
  • The e-mail was sent to the site's configured override address
  • The site's environment setting is "production"

[mworrell]

I would propose that email that is not matching the allow-list would be sent to the override address (if any).