I think one of your users is abusing your referral program by buying up email addresses in mass and spamming users. It very much damages your brand and makes you look like a fly-by-night mattress company.
Check out these email headers!
What happens when you click on it? Well there’s a bunch of mail forwarders, but eventually one will forward you directly to lull, with a hid #. Going to guess they can use that to track down the spammer.
URLs that redirect into each other
So Lull, can we fix?