Tor exit node. Too much legal stuff.

Self-hosted internet is pain in the ass. Cellular services too.

While mail is definitely doable, imho it's not worth the hassle, you'll always have to maintain it, that's definitely not a launch and forget solution.

Smtp isn't that bad so long as you ensure you're not operating an open relay.

Really bad stuff will happen once exploited and it will take major work on your part to undo ranging from getting removed from block lists like XBL to possibly having to renegotiate your ISP contract if they have to get involved.

| Just too complicated and hard to manage.

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lol.. and now its easy.. i remember doing m4 macros for sendmail, now with postfix its easier than ever.

dont host anything you cant properly secure.

Porn. :-D

Yea, Email is a big one... it'd be kind of pointless, because the person on the other end is NOT using a self-hosted solution, odds are, and it would be a ton of work to maintain, etc., and likely less reliable.

I wouldn't self-host my voicemail server, most likely, either. :P Just no point.

Mail server, too many troubles related to domaine name blocking/ban, good for internal network/VPN use but not for anything serious