When testing using email channel, sandbox (premium etc) is incomplete. We rely heavily on our email channel, both in terms of assignment/routing triggers and triggers that handle transforms.

Aside from the default, when spinning up a sandbox, there are zero support emails in the email channel. This leaves us with an incomplete trigger environment for testing - the emails aren't there to receive, the triggers don't match any known support emails.

It is critical for email channel heavy environments to include a full set of emails with matching on the triggers. ie, if there's a returns@shop.zendesk.com in prod, there should be a returns@shop1234.zendesk.com and the triggers should update to use that same username with the new domain.