diff --git a/MailLibrary/ContactList.php b/MailLibrary/ContactList.php
index a408bca..2f2a362 100644
--- a/MailLibrary/ContactList.php
+++ b/MailLibrary/ContactList.php
@@ -11,9 +11,9 @@
 class ContactList implements Iterator, Countable
 {
 	/** @var Contact[] */
-	protected $contacts;
+	protected $contacts = [];
 
-	protected $builtContacts;
+	protected $builtContacts = [];
 
 	public function addContact($mailbox = NULL, $host = NULL, $personal = NULL, $adl = NULL)
 	{
diff --git a/MailLibrary/Drivers/ImapDriver.php b/MailLibrary/Drivers/ImapDriver.php
index eb059e7..c6831a1 100644
--- a/MailLibrary/Drivers/ImapDriver.php
+++ b/MailLibrary/Drivers/ImapDriver.php
@@ -10,6 +10,7 @@
 use greeny\MailLibrary\Mailbox;
 use greeny\MailLibrary\Structures\IStructure;
 use greeny\MailLibrary\Structures\ImapStructure;
+use Nette\Utils\Strings;
 use greeny\MailLibrary\Mail;
 use DateTime;
 
@@ -227,18 +228,21 @@ public function checkFilter($key, $value = NULL) {
 	public function getHeaders($mailId)
 	{
 		$raw = imap_fetchheader($this->resource, $mailId, FT_UID);
-		$lines = explode("\n", $raw);
+		$lines = explode("\n", Strings::fixEncoding($raw));
 		$headers = array();
 		$lastHeader = NULL;
+		
+		// normalize headers
 		foreach($lines as $line) {
-			if(mb_substr($line, 0, 1, 'UTF-8') === " ") {
-				$headers[$lastHeader] .= $line;
+			$firstCharacter = mb_substr($line, 0, 1, 'UTF-8'); // todo: correct assumption that string must be UTF-8 encoded?
+			if(preg_match('/[\pZ\pC]/u', $firstCharacter) === 1) { // search for UTF-8 whitespaces
+				$headers[$lastHeader] .= " " . Strings::trim($line);
 			} else {
 				$parts = explode(':', $line);
-				$name = $parts[0];
+				$name = Strings::trim($parts[0]);
 				unset($parts[0]);
 
-				$headers[$name] = implode(':', $parts);
+				$headers[$name] = Strings::trim(implode(':', $parts));
 				$lastHeader = $name;
 			}
 		}
@@ -254,7 +258,7 @@ public function getHeaders($mailId)
 				$text = '';
 				foreach($decoded as $part) {
 					if($part->charset !== 'UTF-8' && $part->charset !== 'default') {
-						$text .= mb_convert_encoding($part->text, 'UTF-8', $part->charset);
+						$text .= @mb_convert_encoding($part->text, 'UTF-8', $part->charset); // todo: handle this more properly
 					} else {
 						$text .= $part->text;
 					}
diff --git a/MailLibrary/Mail.php b/MailLibrary/Mail.php
index 0431948..42c1dbe 100644
--- a/MailLibrary/Mail.php
+++ b/MailLibrary/Mail.php
@@ -5,6 +5,9 @@
 
 namespace greeny\MailLibrary;
 
+use greeny\MailLibrary\Structures\IStructure;
+use Nette\Utils\Strings;
+
 class Mail {
 	const ANSWERED = 'ANSWERED';
 	const BCC = 'BCC';
@@ -39,10 +42,10 @@ class Mail {
 	const ORDER_CC = SORTCC;
 	const ORDER_SIZE = SORTSIZE;
 
-	/** @var \greeny\MailLibrary\Connection */
+	/** @var Connection */
 	protected $connection;
 
-	/** @var \greeny\MailLibrary\Mailbox */
+	/** @var Mailbox */
 	protected $mailbox;
 
 	/** @var int */
@@ -51,7 +54,7 @@ class Mail {
 	/** @var array */
 	protected $headers = NULL;
 
-	/** @var \greeny\MailLibrary\Structures\IStructure */
+	/** @var IStructure */
 	protected $structure = NULL;
 
 	/** @var array */
@@ -78,7 +81,8 @@ public function __construct(Connection $connection, Mailbox $mailbox, $id)
 	public function __isset($name)
 	{
 		$this->headers !== NULL || $this->initializeHeaders();
-		return isset($this->headers[$this->formatHeaderName($name)]);
+		$key = $this->normalizeHeaderName($this->lowerCamelCaseToHeaderName($name));
+		return isset($this->headers[$key]);
 	}
 
 	/**
@@ -86,10 +90,18 @@ public function __isset($name)
 	 *
 	 * @param string $name
 	 * @return mixed
+	 * @deprecated
 	 */
 	public function __get($name)
 	{
-		return $this->getHeader($name);
+		\trigger_error(\E_USER_DEPRECATED, 'use array access with execat header name instead');
+		return $this->getHeader(
+			$this->normalizeHeaderName($this->lowerCamelCaseToHeaderName($name))
+		);
+	}
+
+	public function __set($name, $value) {
+		throw new \Exception('Mail headers are read-only.');
 	}
 
 	/**
@@ -124,7 +136,12 @@ public function getHeaders()
 	public function getHeader($name)
 	{
 		$this->headers !== NULL || $this->initializeHeaders();
-		return $this->headers[$this->formatHeaderName($name)];
+		$index = $this->normalizeHeaderName($name);
+		if(isset($this->headers[$index])) {
+			return $this->headers[$index];
+		}
+
+		return NULL;
 	}
 
 	/**
@@ -135,9 +152,9 @@ public function getSender() {
 		if($from) {
 			$contacts = $from->getContactsObjects();
 			return (count($contacts) ? $contacts[0] : NULL);
-		} else {
-			return NULL;
 		}
+
+		return NULL;
 	}
 
 	/**
@@ -230,7 +247,7 @@ protected function initializeHeaders()
 		$this->headers = array();
 		$this->connection->getDriver()->switchMailbox($this->mailbox->getName());
 		foreach($this->connection->getDriver()->getHeaders($this->id) as $key => $value) {
-			$this->headers[$this->formatHeaderName($key)] = $value;
+			$this->headers[$this->normalizeHeaderName($key)] = $value;
 		}
 	}
 
@@ -247,15 +264,29 @@ protected function initializeFlags()
 	}
 
 	/**
-	 * Formats header name (X-Received-From => xReceivedFrom)
+	 * Formats header name (X-Received-From => x-recieved-from)
 	 *
-	 * @param string $name
+	 * @param string $name Header name (with dashes, valid UTF-8 string)
 	 * @return string
 	 */
-	protected function formatHeaderName($name)
+	protected function normalizeHeaderName($name)
 	{
-		return lcfirst(preg_replace_callback("~-.~", function($matches){
+		return Strings::normalize(Strings::lower($name));
+	}
+	
+	/**
+	 * Converts camel cased name to normalized header name (xReceivedFrom => x-recieved-from)
+	 *
+	 * @param string $camelCasedName
+	 * @return string name with dashes
+	 */
+	protected function lowerCamelCaseToHeaderName($camelCasedName) {
+		// todo: test this
+		// todo: use something like this instead http://stackoverflow.com/a/1993772
+		$dashedName = lcfirst(preg_replace_callback("~-.~", function($matches){
 			return ucfirst(substr($matches[0], 1));
-		}, $name));
+		}, $camelCasedName));
+		
+		return $this->normalizeHeaderName($dashedName);
 	}
 }
diff --git a/MailLibrary/loader.php b/MailLibrary/loader.php
index 998517c..e11bb40 100644
--- a/MailLibrary/loader.php
+++ b/MailLibrary/loader.php
@@ -6,24 +6,24 @@
 require_once "exceptions.php";
 
 spl_autoload_register(function ($type) {
-        static $paths = array(
-            'greeny\maillibrary\connection' => 'Connection.php',
-            'greeny\maillibrary\mailbox' => 'Mailbox.php',
-            'greeny\maillibrary\selection' => 'Selection.php',
-            'greeny\maillibrary\mail' => 'Mail.php',
-            'greeny\maillibrary\contactlist' => 'ContactList.php',
-            'greeny\maillibrary\contact' => 'Contact.php',
-            'greeny\maillibrary\attachment' => 'Attachment.php',
-            'greeny\maillibrary\structures\istructure' => 'Structures/IStructure.php',
-            'greeny\maillibrary\structures\imapstructure' => 'Structures/ImapStructure.php',
-            'greeny\maillibrary\drivers\idriver' => 'Drivers/IDriver.php',
-            'greeny\maillibrary\drivers\imapdriver' => 'Drivers/ImapDriver.php',
-            'greeny\maillibrary\extensions\maillibraryextension' => 'Extensions/MailLibraryExtension.php',
-        );
+	static $paths = array(
+		'greeny\maillibrary\connection' => 'Connection.php',
+		'greeny\maillibrary\mailbox' => 'Mailbox.php',
+		'greeny\maillibrary\selection' => 'Selection.php',
+		'greeny\maillibrary\mail' => 'Mail.php',
+		'greeny\maillibrary\contactlist' => 'ContactList.php',
+		'greeny\maillibrary\contact' => 'Contact.php',
+		'greeny\maillibrary\attachment' => 'Attachment.php',
+		'greeny\maillibrary\structures\istructure' => 'Structures/IStructure.php',
+		'greeny\maillibrary\structures\imapstructure' => 'Structures/ImapStructure.php',
+		'greeny\maillibrary\drivers\idriver' => 'Drivers/IDriver.php',
+		'greeny\maillibrary\drivers\imapdriver' => 'Drivers/ImapDriver.php',
+		'greeny\maillibrary\extensions\maillibraryextension' => 'Extensions/MailLibraryExtension.php',
+	);
 
-        $type = ltrim(strtolower($type), '\\'); // PHP namespace bug #49143
+	$type = ltrim(strtolower($type), '\\'); // PHP namespace bug #49143
 
-        if (isset($paths[$type])) {
-                require_once __DIR__ . '/' . $paths[$type];
-        }
+	if (isset($paths[$type])) {
+		require_once __DIR__ . '/' . $paths[$type];
+	}
 });
\ No newline at end of file
diff --git a/README.md b/README.md
index 79fc5d9..08f3980 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,17 @@ MailLibrary
 
 A PHP library for downloading mails from server.
 
-Documentation can be found at http://greeny.github.io/MailLibrary/.
\ No newline at end of file
+Documentation can be found at http://greeny.github.io/MailLibrary/.
+
+Testing
+-------
+
+Install dependencies using composer and then run following in library root directory.
+
+````cmd
+# Unix
+vendor\bin\tester -c tests\php-unix.ini tests
+
+# Windows
+vendor\bin\tester -c tests\php-windows.ini tests
+````
diff --git a/composer.json b/composer.json
index 8b0751c..d04e0ac 100644
--- a/composer.json
+++ b/composer.json
@@ -12,9 +12,11 @@
         "files": ["MailLibrary/loader.php"]
     },
     "require": {
-        "php": ">= 5.3.0"
+        "php": ">= 5.3.0",
+        "ext-imap": "*",
+        "nette/utils": "~2.2"
     },
     "require-dev": {
         "nette/tester": "@dev"
     }
-}
\ No newline at end of file
+}
diff --git a/tests/php-unix.ini b/tests/php-unix.ini
new file mode 100644
index 0000000..c758598
--- /dev/null
+++ b/tests/php-unix.ini
@@ -0,0 +1,5 @@
+[PHP]
+;extension_dir = "./ext"
+extension=mbstring.so
+extension=imap.so
+date.timezone = "Europe/Prague"
diff --git a/tests/php-windows.ini b/tests/php-windows.ini
new file mode 100644
index 0000000..f601ad4
--- /dev/null
+++ b/tests/php-windows.ini
@@ -0,0 +1,5 @@
+[PHP]
+extension_dir = "./ext"
+extension=php_mbstring.dll
+extension=php_imap.dll
+date.timezone = "Europe/Prague"