A proof page is a list of checks and a code. It is not a pitch deck. The email that carries it should be just as plain.
One check, then the link
Open with the single fact that is easiest for them to see themselves. “Your homepage at example.co.uk answered over plain http when we fetched it on 12 October” is checkable. “You’re losing £4,000 a month” is not, and Zenvylo will not invent that number for you.
Then paste the proof link and say what it is: a page of the checks, which they can open with no account. Mention the code so they know the page is supposed to match it.
Say who you are
Use your real name, a real email, and a postal address if the law that covers you requires one. In the United States, CAN-SPAM expects an honest subject, a physical address, and a way to opt out. In the UK and EU, cold email to a business can still be regulated — do not buy a scraped personal inbox and blast it. A role address published on the site (hello@, bookings@) is a different situation from someone’s private Gmail, and you should still stop when they ask.
Zenvylo’s terms say the same thing: no spam, and follow the law that applies to the message you send. Read the terms before you turn a scan into a mail merge.
Leave the model’s draft in draft
If your plan writes a first version, treat it as a draft that is only allowed to mention the measured issues. Delete anything fluffy. If the site has no measured issues, do not email them a problem you made up. That lead is a weak one. The score is there to tell you that.
Write the follow-up date down
After you send, set a follow-up on the lead. The Today screen will surface it. If you re-check before you chase and the issue is gone, do not send the old email. See why the second measurement matters and how to find the first list.