You received an invitation to join Reelio and you're wondering - why does the "Accept Invite" button point to outb.co instead of reelio.com?
If you've noticed this, congratulations on being very observant and having excellent internet security hygiene! However, it's not spam. We use a service called outbound.io (now called Zendesk Connect after a recent acquisition) to send our emails. Sending emails reliably and at scale is harder than it seems, so we use their service instead of building it ourselves. Outbound routes all links through itself first before redirecting them to Reelio.
Good catch, and great question - but don't worry! That being said, if you think anyone is impersonating Reelio for nefarious purposes, please contact our customer service team and we'll investigate.