Interactive workbenchNo signup. No network dependencies.
Write something worth opening.
Inbox rehearsal
Never sendsPreview links are disabled. HTML export contains the validated URLs; test them in your sending platform.
What still needs real software?
Permission records, unsubscribe enforcement, sender authentication, deliverability, reputation, bounce handling and reliable bulk delivery remain real systems.
The downloadable skill is a detailed conversational workflow for ChatGPT or Claude, not a native installation guarantee. This browser demo implements only the limited workflow described above.