On Tuesday, August 16, 2016 10:47:35 AM Stefan Monnier wrote: > >> I'm looking for a decentralized instant message system (e.g. XMPP, SIP, > >> ...) where I can be sure that I receive all messages, even if I'm not > >> connected when the message is sent [ Obviously, I'll only receive them > >> when I'm back online. ] > > > > I believe that's called "electronic mail" or "email". > > There's that, and there are SMS messages as well, indeed. > But email is a lot more heavyweight and drowned in spam (e.g. most > people don't get notified right away when they receive an email > message), and SMS is basically limited to cell-phone only (you can find > services that let you send SMS messages from something like a SIP > account, but I haven't found any corresponding service for the > reception of SMS messages, except some that just drop the SMS message > if the SIP delivery cannot be performed because you're not connected).
Google Voice can send and receive text messages (to and from cell phones or other google voice users)--iiuc, those are SMS messages. Currently I don't have anything set up to notify me, but I asume (I know) that can be done within a web browser.