diff --git a/help_scout.gemspec b/help_scout.gemspec
index b01cf8a..76cee6e 100644
--- a/help_scout.gemspec
+++ b/help_scout.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Dennis Paagman", "Miriam Tocino", "Mark Mulder"]
   spec.email         = ["dennispaagman@gmail.com", "miriam.tocino@gmail.com", "markmulder@gmail.com"]
 
-  spec.summary       = "HelpScout is a an api client for Help Scout"
+  spec.summary       = "HelpScout is an API client for Help Scout"
   spec.homepage      = "https://github.com/Springest/help_scout"
   spec.license       = "MIT"
 
@@ -18,11 +18,11 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency "httparty", "~> 0.13"
+  spec.add_runtime_dependency "httparty", "~> 0.14"
 
   spec.add_development_dependency "bundler", "~> 1.12"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rspec", "~> 3.0"
-  spec.add_development_dependency "webmock", "~> 2.0"
+  spec.add_development_dependency "rake", "~> 10.5"
+  spec.add_development_dependency "rspec", "~> 3.5"
+  spec.add_development_dependency "webmock", "~> 2.1"
   spec.add_development_dependency "byebug"
 end
diff --git a/lib/help_scout.rb b/lib/help_scout.rb
index 4076a10..78b9086 100644
--- a/lib/help_scout.rb
+++ b/lib/help_scout.rb
@@ -2,6 +2,12 @@
 require "httparty"
 
 class HelpScout
+  class ValidationError < StandardError; end
+  class NotImplementedError < StandardError; end
+
+  HTTP_CREATED = 201
+  HTTP_BAD_REQUEST = 400
+
   attr_accessor :last_response
 
   def initialize(api_key)
@@ -18,9 +24,16 @@ def initialize(api_key)
   def create_conversation(data)
     post("conversations", { body: data })
 
-    # Extract ID of created conversation from the Location header
-    conversation_uri = last_response.headers["location"]
-    conversation_uri.match(/(\d+)\.json$/)[1]
+    if last_response.code == HTTP_CREATED
+      # Extract ID of created conversation from the Location header
+      conversation_uri = last_response.headers["location"]
+      return conversation_uri.match(/(\d+)\.json$/)[1]
+    elsif last_response.code == HTTP_BAD_REQUEST
+      # Validation failed so return the errors
+      raise ValidationError, last_response.parsed_response["message"]
+    else
+      raise NotImplementedError, "Help Scout returned something that is not implemented by the help_scout gem yet. Sorry."
+    end
   end
 
   # Public: Get conversation
diff --git a/lib/help_scout/version.rb b/lib/help_scout/version.rb
index ec21bdc..6dc051d 100644
--- a/lib/help_scout/version.rb
+++ b/lib/help_scout/version.rb
@@ -1,3 +1,3 @@
 class HelpScout
-  VERSION = "0.1.0"
+  VERSION = "0.2.0"
 end
diff --git a/spec/helpscout_spec.rb b/spec/helpscout_spec.rb
index 312d831..d2148e9 100644
--- a/spec/helpscout_spec.rb
+++ b/spec/helpscout_spec.rb
@@ -18,6 +18,38 @@
         )
       expect(client.create_conversation(data)).to eq '123'
     end
+
+    context 'with invalid input' do
+      it 'returns validation errors' do
+        data = { subject: "Help me!", customer: { email: "" } }
+
+        url = 'https://api.helpscout.net/v1/conversations.json'
+        stub_request(:post, url).
+          to_return(
+            status: 400,
+            headers: {
+               'Content-Type' => 'application/json'
+            },
+            body: { error: "Input could not be validated", message: "Email is not valid" }.to_json
+          )
+
+        expect { client.create_conversation(data) }.to raise_error(HelpScout::ValidationError, "Email is not valid")
+      end
+    end
+
+    context 'with a not implemented status code' do
+      it 'returns a not implemented error' do
+        data = { subject: "Help me!" }
+
+        url = 'https://api.helpscout.net/v1/conversations.json'
+        stub_request(:post, url).
+          to_return(
+            status: 500,
+          )
+
+        expect { client.create_conversation(data) }.to raise_error(HelpScout::NotImplementedError)
+      end
+    end
   end
 
   describe '#search_conversations' do