Add FAQ for school teachers

[MyfanwyNixon]

A teacher writes:

I am a secondary school teacher who has been encouraging students to write to their MP on issues they feel strongly about using your site. Unfortunately, our school email system blocks email to students from external addresses unless we add them to an allowed list. Would you be able to tell me the email address which the confirmation emails come from so that I can ask our school IT department to add it to the allowed list? I looked for this information on your web site but could not find it.

This echoes a similar issue from a couple of weeks ago. Wouldn't hurt to mention the confirmation email address, but also that responses from the MP would be blocked unless they also whitelist that domain.