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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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croft
From your IP address. If you used your email to log in to their site, they would then be able to connect your email to your location.
If you didn't log in, they've got it from the IP address you were on when you opened the emails, by embedding remote content and then seeing where you called it from. Mailing lists routinely use that method to see if people are actually opening the mail, it's only a small step to lookup the IP address too and see where they are opening it.