I thought Re stood for Regarding, not Replying?
It does but your email subject is what the email is regarding so it’s superfluous and the Re: is applied automatically when you reply to an email so it does imply that it’s a reply.
@PhilDAS started
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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I thought Re stood for Regarding, not Replying?