diff --git a/cf_remote/main.py b/cf_remote/main.py
index d97f016..127e45b 100644
--- a/cf_remote/main.py
+++ b/cf_remote/main.py
@@ -1,6 +1,7 @@
 import argparse
 import os
 import sys
+import re
 
 from cf_remote import log
 from cf_remote import version
@@ -504,7 +505,7 @@ def validate_command(command, args):
     if command in ["sudo", "run"]:
         if len(args.remote_command) != 1:
             raise CFRExitError(
-                "cf-remote sude/run requires exactly 1 command (use quotes)"
+                "cf-remote sudo/run requires exactly 1 command (use quotes)"
             )
         args.remote_command = args.remote_command[0]
 
@@ -627,8 +628,10 @@ def resolve_hosts(string, single=False, bootstrap_ips=False):
             hosts = get_cloud_hosts(name, bootstrap_ips)
             ret.extend(hosts)
             log.debug("found in cloud, adding '{}'".format(hosts))
-        else:
+        elif name == "localhost" or re.search(r"[@:.]", name):
             ret.append(name)
+        else:
+            raise CFRUserError("'{}' does not exist.".format(name))
 
     if single:
         if len(ret) != 1: