How can I be sure that the person who sent a request has a valid email address?
A. When users fill in our form, they have to fill in their email address twice, to avoid typos, but the address may still be wrong. If you really want to make sure you can test the address by sending a message before actually translating (like “Hi, I have received your request, I will deal with it within two or three days”). Then look for an error message coming back (or you may also get a reply from the user).