Thanks!
"One question: how long are the URL and the content preserved?"
You decide. If you don't delete it yourself, it'll be there forever. And it's private. You decide who to share with. You decide whether to keep it or not.
We will commit to improving mailpin, making it a robust and useful service.
And mailp.in solves that issue perfectly. If someone sends you an email that is chock full of content that should be shared, just mailpin it.
One question: how long are the URL and the content preserved?