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amazon SES only accepts domains encoded in punycode, an encoding that converts utf-8 into an ascii encoding that browsers and mailservers recognise. We currently just send through emails as we store them (in full unicode), which means any rogue characters break SES and cause us to put the email in technical-failure. Most of these appear to be typos and rogue control characters, but there is a small chance that it could be a real domain (eg https://🅂𝖍𝐤ₛᵖ𝒓.ⓜ𝕠𝒃𝓲/🆆🆃🅵/). We should encode to and reply-to-address emails as punycode to make sure that they can always be sent. The chance that anyone actually uses a unicode domain name for their email is probably pretty low, but we should allow it for completeness.