Show HN: Get webmail link for any(ish) e-mail address (email-host-detector.optionzero.co)

When building applications that use magic links or email verification, I kept being asked to implement a link that sends the user straight to their email client to see their newly arrived e-mail.

Haven't found an existing tool for this, and the feature always gets bumped because it's slightly too complex to comfortably implement and maintain on a client's budget. So I finally threw one together this morning.

It's pretty simple on the backend - just an MX record lookup and then a map from MX domains to webmail URLs.