Bye bye Groovy, you won't be missed :(

src/main/java/io/kamax/mxisd/threepid/connector/IThreePidConnector.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.threepid.connector;
+
+public interface IThreePidConnector {
+
+    String getId();
+
+    String getMedium();
+
+}

src/main/java/io/kamax/mxisd/threepid/connector/email/EmailSmtpConnector.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.threepid.connector.email;
+
+import com.sun.mail.smtp.SMTPTransport;
+import io.kamax.matrix.ThreePidMedium;
+import io.kamax.mxisd.config.threepid.connector.EmailSmtpConfig;
+import io.kamax.mxisd.exception.InternalServerError;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import javax.mail.Message;
+import javax.mail.MessagingException;
+import javax.mail.Session;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeMessage;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+@Component
+public class EmailSmtpConnector implements IEmailConnector {
+
+    private Logger log = LoggerFactory.getLogger(EmailSmtpConnector.class);
+
+    private EmailSmtpConfig cfg;
+    private Session session;
+
+    @Autowired
+    public EmailSmtpConnector(EmailSmtpConfig cfg) {
+        this.cfg = cfg;
+        session = Session.getInstance(System.getProperties());
+    }
+
+    @Override
+    public String getId() {
+        return "smtp";
+    }
+
+    @Override
+    public String getMedium() {
+        return ThreePidMedium.Email.getId();
+    }
+
+    @Override
+    public void send(String senderAddress, String senderName, String recipient, String content) {
+        if (StringUtils.isBlank(content)) {
+            throw new InternalServerError("Notification content is empty");
+        }
+
+        try {
+            InternetAddress sender = new InternetAddress(senderAddress, senderName);
+            MimeMessage msg = new MimeMessage(session, IOUtils.toInputStream(content, StandardCharsets.UTF_8));
+            msg.setHeader("X-Mailer", "mxisd"); // FIXME set version
+            msg.setSentDate(new Date());
+            msg.setFrom(sender);
+            msg.setRecipients(Message.RecipientType.TO, recipient);
+            msg.saveChanges();
+
+            log.info("Sending invite to {} via SMTP using {}:{}", recipient, cfg.getHost(), cfg.getPort());
+            SMTPTransport transport = (SMTPTransport) session.getTransport("smtp");
+            transport.setStartTLS(cfg.getTls() > 0);
+            transport.setRequireStartTLS(cfg.getTls() > 1);
+
+            log.info("Connecting to {}:{}", cfg.getHost(), cfg.getPort());
+            transport.connect(cfg.getHost(), cfg.getPort(), cfg.getLogin(), cfg.getPassword());
+            try {
+                transport.sendMessage(msg, InternetAddress.parse(recipient));
+                log.info("Invite to {} was sent", recipient);
+            } finally {
+                transport.close();
+            }
+        } catch (UnsupportedEncodingException | MessagingException e) {
+            throw new RuntimeException("Unable to send e-mail invite to " + recipient, e);
+        }
+    }
+
+}

src/main/java/io/kamax/mxisd/threepid/connector/email/IEmailConnector.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.threepid.connector.email;
+
+import io.kamax.matrix.ThreePidMedium;
+import io.kamax.mxisd.threepid.connector.IThreePidConnector;
+
+public interface IEmailConnector extends IThreePidConnector {
+
+    @Override
+    default String getMedium() {
+        return ThreePidMedium.Email.getId();
+    }
+
+    void send(String senderAddress, String senderName, String recipient, String content);
+
+}