What's your point? You might as well say HTTP is a method that allows strangers to get files from my server! While technically true, it doesn't say much.

Yes, people can send you false pings, which is why you need to go back through the name server and do a reverse lookup, and once you fetch the message you need to parse it and make sure it within bounds (less than 160 characters or whatever) and addressed to you (has @foo in the message text.) and is not spam (the name isn't in your killfile, is in your whitelist, akismet says it isn't spam, etc.) Rate limiting helps too, real people aren't going to send you 100 messages a second.