Use mailgun for sending emails.

Mage.Server/config/config.xml

@@ -39,6 +39,8 @@
             saveGameActivated="false"
             authenticationActivated="false"
             googleAccount=""
+            mailgunApiKey=""
+            mailgunDomain=""
     />
     <playerTypes>
         <playerType name="Human" jar="mage-player-human.jar" className="mage.player.human.HumanPlayer"/>

Mage.Server/pom.xml

@@ -184,6 +184,21 @@
             <version>1.4.2</version>
             <type>jar</type>
         </dependency>
+        <dependency>
+            <groupId>com.sun.jersey</groupId>
+            <artifactId>jersey-core</artifactId>
+            <version>1.19</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.jersey</groupId>
+            <artifactId>jersey-client</artifactId>
+            <version>1.19</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.jersey.contribs</groupId>
+            <artifactId>jersey-multipart</artifactId>
+            <version>1.19</version>
+        </dependency>
     </dependencies>
 
     <build>

Mage.Server/src/main/java/mage/server/MageServerImpl.java

@@ -136,7 +136,7 @@ public class MageServerImpl implements MageServer {
         }
         String authToken = generateAuthToken();
         activeAuthTokens.put(email, authToken);
-        if (!GmailClient.sendMessage(email, "XMage Password Reset Auth Token",
+        if (!MailgunClient.sendMessage(email, "XMage Password Reset Auth Token",
                 "Use this auth token to reset your password: " + authToken + "\n" +
                 "It's valid until the next server restart.")) {
             sendErrorMessageToClient(sessionId, "There was an error inside the server while emailing an auth token");

Mage.Server/src/main/java/mage/server/MailgunClient.java

@@ -0,0 +1,37 @@
+package mage.server;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.filter.HTTPBasicAuthFilter;
+import com.sun.jersey.core.util.MultivaluedMapImpl;
+import javax.ws.rs.core.MediaType;
+import mage.server.util.ConfigSettings;
+import org.apache.log4j.Logger;
+
+public class MailgunClient {
+
+    private static final Logger logger = Logger.getLogger(Main.class);
+
+    public static boolean sendMessage(String email, String subject, String text) {
+        if (email.length() == 0) {
+            logger.info("Email is not sent because the address is empty");
+            return false;
+        }
+        Client client = Client.create();
+        client.addFilter(new HTTPBasicAuthFilter("api", ConfigSettings.getInstance().getMailgunApiKey()));
+        String domain = ConfigSettings.getInstance().getMailgunDomain();
+        WebResource webResource = client.resource("https://api.mailgun.net/v3/" + domain + "/messages");
+        MultivaluedMapImpl formData = new MultivaluedMapImpl();
+        formData.add("from", "XMage <postmaster@" + domain + ">");
+        formData.add("to", email);
+        formData.add("subject", subject);
+        formData.add("text", text);
+        ClientResponse response =  webResource.type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class, formData);
+        boolean succeeded = response.getStatus() == 200;
+        if (!succeeded) {
+            logger.error("Error sending message to " + email + ". Status code: " + response.getStatus());
+        }
+        return succeeded;
+    }
+}

Mage.Server/src/main/java/mage/server/Main.java

@@ -102,17 +102,6 @@ public class Main {
             }
         }
 
-        ConfigSettings config = ConfigSettings.getInstance();
-        if (config.isAuthenticationActivated()) {
-            logger.info("Initializing GmailClient. This will open up a tab in your browser to ask for an OAuth access token.");
-            if (GmailClient.initilize()) {
-                logger.info("GmailClient initilized successfully.");
-            } else {
-                logger.fatal("GmailClient initialization failed.");
-                return;
-            }
-        }
-
         logger.info("Loading cards...");
         if (fastDbMode) {
             CardScanner.scanned = true;
@@ -122,6 +111,7 @@ public class Main {
         logger.info("Done.");
 
         deleteSavedGames();
+        ConfigSettings config = ConfigSettings.getInstance();
         for (GamePlugin plugin : config.getGameTypes()) {
             GameFactory.getInstance().addGameType(plugin.getName(), loadGameType(plugin), loadPlugin(plugin));
         }

Mage.Server/src/main/java/mage/server/Session.java

@@ -99,7 +99,7 @@ public class Session {
                 return returnMessage;
             }
             AuthorizedUserRepository.instance.add(userName, password, email);
-            if (GmailClient.sendMessage(email, "XMage Registration Completed",
+            if (MailgunClient.sendMessage(email, "XMage Registration Completed",
                     "You are successfully registered as " + userName + ".")) {
                 logger.info("Sent a registration confirmation email to " + email + " for " + userName);
             } else {

Mage.Server/src/main/java/mage/server/util/ConfigSettings.java

@@ -139,6 +139,14 @@ public class ConfigSettings {
         return config.getServer().getGoogleAccount();
     }
 
+    public String getMailgunApiKey() {
+        return config.getServer().getMailgunApiKey();
+    }
+
+    public String getMailgunDomain() {
+        return config.getServer().getMailgunDomain();
+    }
+
     public List<Plugin> getPlayerTypes() {
         return config.getPlayerTypes().getPlayerType();
     }

Mage.Server/src/main/xml-resources/jaxb/Config/Config.xsd

@@ -36,6 +36,8 @@
 			<xs:attribute name="saveGameActivated" type="xs:boolean" use="optional"/>
 			<xs:attribute name="authenticationActivated" type="xs:boolean" use="optional"/>
 			<xs:attribute name="googleAccount" type="xs:string" use="optional"/>
+			<xs:attribute name="mailgunApiKey" type="xs:string" use="optional"/>
+			<xs:attribute name="mailgunDomain" type="xs:string" use="optional"/>
 		</xs:complexType>
 	</xs:element>