Email is the last surface where the rendering environment is genuinely out of your control and genuinely varied. The gap between a preview tool and an inbox is where the expensive surprises live.
What to put in the public brief
- Which email client and platform
- That they will receive a real email at an address they control
- That screenshots are required, including dark mode
- Roughly how long
- What you will do with their address, and that you will delete it
Keep the campaign content private until a spot is reserved.
What to put in the private instructions
Say which tab and which folder to check
Ask them to report where it landed before opening it, because opening from a search hides the placement.
Ask for images-off first
Most clients block images by default on first contact from an unknown sender. If the email is unreadable without them, that is a finding and not an edge case.
Ask for dark mode explicitly
Same email, system dark mode on. Ask them to look at logos and buttons specifically.
Ask them to scroll to the very bottom
Gmail clips messages over a size threshold and replaces the tail with a link. If your unsubscribe is past the cut, that is a compliance problem rather than a design one.
Proof worth requiring
Ask for
Screenshots at each stage — placement, images off, images on, dark mode, bottom of the message — plus the client, the app version and the device.
Do not ask for
Their email password or access to the account. Everything here is observable by the recipient and reportable in screenshots.
When this task type is the wrong tool
If the email is not arriving at all, this is not a rendering problem. Fix authentication and deliverability first, or you will pay several people to confirm the same absence.
If you want to know whether the message persuades rather than whether it displays, that is ad creative feedback applied to an email.