How can a server provider do this? Apart from blocking port 25 of
course, and forcing all emails of their customers to go through their
SMTP server, in which case they wouldn't be selling a bare machine
anymore. If it was "not even that difficult", I'd guess they would all
do it.
Linode blocks port 25 on all new accounts/servers. You need to talk to
them and explain who and what you are, before they open it manually for
you.
Apparently that's not a good strategy: their 509952 IPs are blocked by
uceprotect, too; 217 of these IPs (again 0.05%) sent spam in the last
seven days. And indeed what you suggest is not a solution for the
WordPress site of a honest customer that get hacked, for instance.
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