I don’t think I’ve ever come across this before, but I responded to an email sent to me from a public library in the US and was surprised to receive the following delivery failure message…
SMTP error from remote mail server after end of data:
host csplspam.xxxxxxxx.lib.ia.us [xxx.xxx.160.30]:
557 Your IP address is from a blacklisted country. Disconnecting.
…I know spam’s a serious problem, but isn’t blocking all email from a whole European country kind of excessive?