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Thankyou for contacting the xxxxx proofreading service. Thankyou for choosing this service, providing efficient and accurate proofreading services for all users of email advertising. To use this service, simply send emails to be proofread to xxx@xxx. Proofreading services will be charged at £200 per email, and payment is due within one month of receiving an invoice. By sending emails to be checked, you agree to the charges, and you agree that the primary point of contact for yourselves is the email address from which the emails originate. Results and invoices will be sent to this address, so make sure it is valid. Please do not send emails if you do not agree to these points.
Since you are a new customer, this first email is proofread below for free:
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Their email didn't mention that their sending email address would not receive, and British contract law has a presumption that communication that is sent is received, so when they followed up with ten or so subsequent spams, all of which I proofread, I probably would have had a fairly strong case in court to be paid for my work. Especially given one of their emails had "[pre-send]" in the subject line. It's kind of a shame I didn't take it any further than emailing invoices.