Everyone has way too many things to do, so your argument that you have way too many things to do is a bit specious.
Let's look at this logically, on a case-by-case basis:
0) You don't have email.
This is the degenerate case. In this situation, it doesn't matter what I do, you don't have email, you're not going to get them anyway. No problem.
1) You run your own mail-server.
This is a non-typical case, but since you're on /., you're presumably technically astute, so it's a possibility.
If you're running your own mail server, you *choose* which blacklists to use, and you have final control over what is or is not accepted on your system. The responsibility is yours to configure your system to accept valid email, not to blindly follow the dictates of some blacklist service.
2) You use someone else's mailserver.
(a) You have contact information for your service provider.
If I'm sending you email, and your service's mailserver is ignoring my valid email because the blacklist they're using is painting large swaths of the 'net with a rather wide brush, then the fault is theirs. It is your responsibility to contact your service provider and notify them of this problem, and leave it up to them to fix the problem.
(b) You have no contact information for your service provider.
You're doomed. Any sort of problem with your mail will cut you off from the rest of the world. Not getting my email is the least of your problems. and nobody else on the Internet can be expected to take the time to cater to your screwed up situation. Remember, everyone has way too many things to do.
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Now, all of this is predicated on a few assumptions that should be called out and made clear. First of all, there's a presumption that I'm running a proper mailserver, and I'm not running an open relay, or spamming people, or engaging in other unsavory activities.
Should my system engage in activities that would get my system blacklisted with good reason, then it *does* become my responsibility to remove my system from the blacklist(s) in question. Why my system is engaged in unsavory activities is irrelevent -- it doesn't matter if my system was compromised, or if I'm actually using it to spam people. My system, my problem.
Second, there's a presumption that my system is abiding by the appropriate network standards and protocols. If I'm sending out email with illegal formats, there's no guarantee that anyone should accept it. Bringing my system into compliance is my responsibility, not yours, or anyone else's.
Third, we're talking about blacklists, and not about the content of the message being sent wrongly being identified as spam. That's a separate issue, and requires a modicum of agreement between the sender and the receiver that's outside of this situation. (It can be a worthwhile discussion all on its own.)
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I'm not sure I understand your analogy about a government accepting packages.