Ask HN: A service where newsletter operators can advertise their newsletter?

Around a week ago I came across a website where newsletter operators can advertise their newsletter, and people can visit to find new newsletters to subscribe to.

The service wasn't posted to HN a week ago, it was older than that. It might have been on Product Hunt too.

Unfortunately I was using a different device so I don't have the web history, and I can't remember the name of the service.

The motto/slogan was something like:

"A collection of newsletters looking for subscribers"

...or something with that meaning.

After 40 minutes of Googling, I can't find it. Does anybody here recognise this and have a clue what the name could have been?

Thank you.