I looked for a service like that a year or so ago and found this: https://click2mail.com/email-to-mail https://click2mail.com/email-to-mail At the time their

I looked for a service like that a year or so ago and found this: https://click2mail.com/email-to-mail https://click2mail.com/email-to-mail At the time their signup process was broken so I couldn't test it out, but the idea is very similar to what you described. You send an email to them with a specially formatted subject line, plus a body and/or attachments, and they mail it for you.