HippoMango Email Check

Catch email issues before your customers do.

Paste an email’s HTML or upload the file. You get a report you can read, keep and send to whoever has to fix it.

Free · no signup · your email is not stored.

The email’s HTML

Paste the whole message if you can. In Gmail, open the email, choose Show original, and copy everything — the headers at the top as well as the HTML. A whole message runs 7 checks instead of 5, because the headers and the message structure carry two things a fragment of HTML cannot. We handle the encoding either way. Up to 2 MB.

Brand name (optional)

Lets us tell your logo from a product image. Without it we grade those findings lower rather than guessing.

See a sample report

Your email is processed and discarded. It is never written to disk or kept.
13 checks exist; how many run depends on what your input can support, and the report says which.
A clean result means no issues were found by the checks performed, not that the email is error-free.