SMS being popular where exactly..? Beside that I don't suppose you'd just block period, without giving a legit human user the way to authenticate as such and unlock communication.
---- Denver Gingerich ha scritto ---- >On Thu, Feb 08, 2018 at 02:27:50PM +0100, Jan Pinkas wrote: >> We need technical solutions: >> 1. Default behavior: don't accept messages from contacts without >> subscription. This is default for other IM systems. > >This is not the default for the most popular IM system: SMS. > >Please do not implement this on your server, otherwise many useful services >(such as those that emulate or integrate with SMS) will not work anymore, and >your users will have no idea why. > >There are lots of other ways to combat spam. I've outlined the steps used in >the Prosody configuration that I and some friends use here: >https://lists.debian.org/debian-rtc/2018/02/msg00000.html . > >I built and operate https://jmp.chat/ (JMP) - a service that lets you send and >receive text and picture messages using a real phone number from your existing >XMPP account. Though we like to advertise that XMPP is great and you can use >any XMPP server with JMP, we realistically won't be able to do that much >longer, exactly because server operators are starting to use the "strategy" >you described. We constantly have to debug situations where a user's server >suddenly stops allowing messages from contacts not in their roster, and it is >very painful, both for us and the user. We do maintain a list of recommended >servers at https://jmp.chat/suggested_servers.html but not everyone wants to >use one of those (or maybe has an account elsewhere already). > >I really don't want to create a public list of non-recommended servers (i.e. >those that do not work well with JMP and other SMS services because they >silently ignore messages from contacts not in their users' rosters). So >please use other spam-fighting techniques instead, such as those discussed in >the Manifesto, and those at >https://lists.debian.org/debian-rtc/2018/01/msg00005.html . > >I'm happy to respond to any questions about this or about JMP generally. >Thanks, everyone, for your work to improve the state of XMPP servers! > >Denver >https://jmp.chat/