Cozyroom.xyz might be a bit more popular than Pingly. We know about 1 link to it since March 2021 and only 1 link to Pingly. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If they're hitting the outbound SMTP servers, there's no way (at least that I know of) to protect the IP/servers via obfuscation with a service like Cloudflare etc. Email deliverability relies heavily on the source IP of the sending SMTP for reputation and is going to be viewable in the headers of an email. Also changing IPs isn't a small task unless you're sitting on a load of good reputation IPs that are... - Source: Hacker News / over 2 years ago
There’s no whisper, but you might like https://cozyroom.xyz/. Source: about 3 years ago
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