Free tool
Check it before you send it.
Paste your email HTML for an instant report card: Gmail clipping, missing alt text, unsubscribe link, malformed links, spam triggers, and a live preview in light and dark mode. Free, no signup, nothing stored.
Emails that pass every check, automatically.
The GoodPostal editor previews light and dark mode side by side, inserts the unsubscribe link on every campaign, and keeps emails lean enough that Gmail never clips them.