diff --git a/broccolini-discord.js b/broccolini-discord.js
index b72cca3..20f4f1e 100644
--- a/broccolini-discord.js
+++ b/broccolini-discord.js
@@ -99,6 +99,40 @@ client.on('interactionCreate', async interaction => {
     if (handled) return;
   }
 
+  if (interaction.isModalSubmit() && interaction.customId.startsWith('signature_modal_')) {
+    // Handle signature modal submit
+    try {
+      const valediction = interaction.fields.getTextInputValue('valediction');
+      const displayName = interaction.fields.getTextInputValue('display_name');
+      const tagline = interaction.fields.getTextInputValue('tagline');
+      
+      const StaffSignature = mongoose.model('StaffSignature');
+      await StaffSignature.findOneAndUpdate(
+        { userId: interaction.user.id },
+        { 
+          userId: interaction.user.id,
+          valediction,
+          displayName,
+          tagline,
+          updatedAt: new Date()
+        },
+        { upsert: true, new: true }
+      );
+      
+      await interaction.reply({ 
+        content: 'Signature settings saved successfully!', 
+        ephemeral: true 
+      });
+    } catch (err) {
+      console.error('Signature modal submit error:', err);
+      await interaction.reply({ 
+        content: 'Failed to save signature settings.', 
+        ephemeral: true 
+      });
+    }
+    return;
+  }
+
   if (interaction.isModalSubmit() && ['ticket_modal', 'ticket_modal_thread', 'ticket_modal_channel'].includes(interaction.customId)) {
     return handleTicketModal(interaction);
   }
diff --git a/commands/register.js b/commands/register.js
index c525063..2edc0b1 100644
--- a/commands/register.js
+++ b/commands/register.js
@@ -572,8 +572,14 @@ async function registerCommands() {
           .addUserOption(opt =>
             opt.setName('user').setDescription('Discord user').setRequired(true)
           )
-      )
-  ];
+      ),
+
+    new SlashCommandBuilder()
+      .setName('signature')
+      .setDescription('Set your personal email signature (valediction, display name, tagline)')
+      .setContexts([InteractionContextType.Guild])
+      .setIntegrationTypes([ApplicationIntegrationType.GuildInstall])
+      .setDefaultMemberPermissions(PermissionFlagsBits.ManageMessages)
 
   const contextMenuCommands = [
     new ContextMenuCommandBuilder()
diff --git a/handlers/commands.js b/handlers/commands.js
index bc7c989..2191b04 100644
--- a/handlers/commands.js
+++ b/handlers/commands.js
@@ -874,6 +874,57 @@ async function handleCommand(interaction) {
     }
   }
 
+  // /signature
+  if (interaction.commandName === 'signature') {
+    try {
+      await interaction.deferReply({ ephemeral: true });
+      
+      // Fetch existing signature data if it exists
+      const StaffSignature = mongoose.model('StaffSignature');
+      const existingSignature = await StaffSignature.findOne({ userId: interaction.user.id }).lean();
+      
+      // Create modal
+      const { ModalBuilder, ActionRowBuilder, TextInputBuilder, TextInputStyle } = require('discord.js');
+      const modal = new ModalBuilder()
+        .setCustomId(`signature_modal_${interaction.user.id}`)
+        .setTitle('Staff Signature Settings');
+      
+      // Add text inputs to modal
+      const valedictionInput = new TextInputBuilder()
+        .setCustomId('valediction')
+        .setLabel('Valediction (e.g. "Best regards", "Thanks")')
+        .setStyle(TextInputStyle.Short)
+        .setRequired(false)
+        .setValue(existingSignature?.valediction || '');
+      
+      const displayNameInput = new TextInputBuilder()
+        .setCustomId('display_name')
+        .setLabel('Display Name (e.g. "Support Team")')
+        .setStyle(TextInputStyle.Short)
+        .setRequired(false)
+        .setValue(existingSignature?.displayName || '');
+      
+      const taglineInput = new TextInputBuilder()
+        .setCustomId('tagline')
+        .setLabel('Tagline (e.g. "Technical Support Specialist")')
+        .setStyle(TextInputStyle.Short)
+        .setRequired(false)
+        .setValue(existingSignature?.tagline || '');
+      
+      const valedictionRow = new ActionRowBuilder().addComponents(valedictionInput);
+      const displayNameRow = new ActionRowBuilder().addComponents(displayNameInput);
+      const taglineRow = new ActionRowBuilder().addComponents(taglineInput);
+      
+      modal.addComponents(valedictionRow, displayNameRow, taglineRow);
+      
+      await interaction.showModal(modal);
+    } catch (err) {
+      console.error('Signature command error:', err);
+      await interaction.editReply({ content: 'Failed to open signature settings.', ephemeral: true });
+    }
+    return;
+  }
+
   // /accountinfo
   if (interaction.commandName === 'accountinfo') {
     await handleAccountInfoCommand(interaction);
diff --git a/models.js b/models.js
index 618e860..345ccfb 100644
--- a/models.js
+++ b/models.js
@@ -860,9 +860,27 @@ mongoose.model('StaffSettings', new mongoose.Schema({
 }));
 
 mongoose.model('StaffNotification', new mongoose.Schema({
+  userId: { type: String, required: true, unique: true },
+  guildId: String,
+  channelId: String,
+  cooldownHours: { type: Number, default: 1 },
+  updatedAt: { type: Date, default: Date.now }
+}));
+
+mongoose.model('StaffSignature', new mongoose.Schema({
+  userId: { type: String, required: true, unique: true },
+  guildId: { type: String, required: true },
+  valediction: { type: String, default: '' },
+  displayName: { type: String, default: '' },
+  tagline: { type: String, default: '' },
+  updatedAt: { type: Date, default: Date.now }
+}));
+
+mongoose.model('StaffSignature', new mongoose.Schema({
     userId: { type: String, required: true, unique: true },
-    guildId: String,
-    channelId: String,
-    cooldownHours: { type: Number, default: 1 },
+    guildId: { type: String, required: true },
+    valediction: { type: String, default: '' },
+    displayName: { type: String, default: '' },
+    tagline: { type: String, default: '' },
     updatedAt: { type: Date, default: Date.now }
 }));
diff --git a/services/gmail.js b/services/gmail.js
index af0962b..69ed16a 100644
--- a/services/gmail.js
+++ b/services/gmail.js
@@ -157,14 +157,63 @@ async function sendTicketClosedEmail(ticket, discordDisplayName) {
   }
 }
 
+const { mongoose } = require('../db-connection');
+const StaffSignature = mongoose.model('StaffSignature');
+
+/**
+ * Get formatted signature blocks (text and HTML) for a staff member
+ * @param {string} userId - Discord user ID
+ * @returns {Promise<{text: string, html: string}>} Signature blocks
+ */
+async function getStaffSignatureBlocks(userId) {
+  try {
+    const signature = await StaffSignature.findOne({ userId }).lean();
+    
+    if (!signature) {
+      return {
+        text: '',
+        html: ''
+      };
+    }
+    
+    const valediction = signature.valediction || '';
+    const displayName = signature.displayName || '';
+    const tagline = signature.tagline || '';
+    
+    const textSignature = [
+      valediction,
+      displayName,
+      tagline
+    ].filter(Boolean).join('\n');
+    
+    const htmlSignature = [
+      valediction ? `<p style="margin: 0;">${escapeHtml(valediction)}</p>` : '',
+      displayName ? `<p style="margin: 0; font-weight: bold;">${escapeHtml(displayName)}</p>` : '',
+      tagline ? `<div style="color: #666; font-size: 12px;">${escapeHtml(tagline)}</div>` : ''
+    ].filter(Boolean).join('\n');
+    
+    return {
+      text: textSignature,
+      html: htmlSignature
+    };
+  } catch (err) {
+    console.error('Error fetching staff signature:', err);
+    return {
+      text: '',
+      html: ''
+    };
+  }
+}
+
 /**
  * Send a notification email in the ticket thread (e.g. escalation, high-priority).
  * @param {Object} ticket - Ticket with gmailThreadId, senderEmail, subject
  * @param {string} subjectLine - Subject line (e.g. "Ticket escalated" or "Priority updated")
  * @param {string} messageBody - Plain or HTML message body
  * @param {string} [fromLabel] - Label for "From" (e.g. "Support on Discord")
+ * @param {string} [userId] - Discord user ID for signature (optional)
  */
-async function sendTicketNotificationEmail(ticket, subjectLine, messageBody, fromLabel) {
+async function sendTicketNotificationEmail(ticket, subjectLine, messageBody, fromLabel, userId = null) {
   try {
     const gmail = getGmailClient();
     const recipientEmail = extractRawEmail(ticket.senderEmail || '').toLowerCase();
@@ -191,6 +240,13 @@ async function sendTicketNotificationEmail(ticket, subjectLine, messageBody, fro
     const label = escapeHtml(fromLabel || CONFIG.SUPPORT_NAME || 'Support');
     const safeBody = escapeHtml(messageBody || '').replace(/\n/g, '<br>');
     const safeLogoUrl = escapeHtml(CONFIG.LOGO_URL || '');
+    
+    // Get staff signature if userId provided
+    let signatureBlocks = { text: '', html: '' };
+    if (userId) {
+      signatureBlocks = await getStaffSignatureBlocks(userId);
+    }
+    
     const safeSignature = escapeHtml(CONFIG.SIGNATURE || '');
     const htmlBody = `
       <div style="font-family: sans-serif; font-size: 14px; color: #333;">
@@ -203,8 +259,9 @@ async function sendTicketNotificationEmail(ticket, subjectLine, messageBody, fro
               ${safeLogoUrl ? `<img src="${safeLogoUrl}" width="65">` : ''}
             </td>
             <td style="border-left: 1px solid #ddd; padding-left: 12px;">
-              <p style="margin: 0; font-weight: bold;">${label}</p>
-              <div style="color: #666; font-size: 12px;">${safeSignature}</div>
+              ${signatureBlocks.html || `<p style="margin: 0; font-weight: bold;">${label}</p>`}
+              ${signatureBlocks.html ? '<hr style="border:none; border-top:1px solid #ddd; margin:10px 0;">' : ''}
+              ${signatureBlocks.html ? signatureBlocks.html : `<div style="color: #666; font-size: 12px;">${safeSignature}</div>`}
             </td>
           </tr>
         </table>
@@ -237,6 +294,84 @@ async function sendTicketNotificationEmail(ticket, subjectLine, messageBody, fro
   }
 }
 
+/**
+ * Send a Gmail reply to a ticket
+ * @param {string} threadId - Gmail thread ID
+ * @param {string} replyText - Reply text
+ * @param {string} recipientEmail - Recipient email
+ * @param {string} subject - Subject line
+ * @param {string} discordUser - Discord user name
+ * @param {string} messageId - Message ID (optional)
+ * @param {string} userId - Discord user ID for signature (optional)
+ */
+async function sendGmailReply(
+  threadId,
+  replyText,
+  recipientEmail,
+  subject,
+  discordUser,
+  messageId,
+  userId = null
+) {
+  const gmail = getGmailClient();
+
+  const utf8Subject = `=?utf-8?B?${Buffer.from(
+    `Re: ${subject}`
+  ).toString('base64')}?=`;
+  const safeUser = escapeHtml(discordUser);
+  const safeReply = escapeHtml(replyText).replace(/\n/g, '<br>');
+  const safeLogoUrl = escapeHtml(CONFIG.LOGO_URL || '');
+  const safeSignature = escapeHtml(CONFIG.SIGNATURE || '');
+  
+  // Get staff signature if userId provided
+  let signatureBlocks = { text: '', html: '' };
+  if (userId) {
+    signatureBlocks = await getStaffSignatureBlocks(userId);
+  }
+
+  const htmlBody = `
+    <div style="font-family: sans-serif; font-size: 14px; color: #333;">
+      <p><strong>From:</strong> ${safeUser} on Discord</p>
+      <p>${safeReply}</p>
+      <hr style="border:none; border-top:1px solid #ddd; margin:20px 0;">
+      <table border="0" cellpadding="0" cellspacing="0">
+        <tr>
+          <td style="padding-right: 12px;">
+            ${safeLogoUrl ? `<img src="${safeLogoUrl}" width="65">` : ''}
+          </td>
+          <td style="border-left: 1px solid #ddd; padding-left: 12px;">
+            ${signatureBlocks.html || `<p style="margin: 0; font-weight: bold;">${safeUser}</p>`}
+            ${signatureBlocks.html ? '<hr style="border:none; border-top:1px solid #ddd; margin:10px 0;">' : ''}
+            ${signatureBlocks.html ? signatureBlocks.html : `<div style="color: #666; font-size: 12px;">${safeSignature}</div>`}
+          </td>
+        </tr>
+      </table>
+    </div>`;
+
+  const headers = [
+    `From: ${CONFIG.MY_EMAIL}`,
+    `To: ${recipientEmail}`,
+    `Subject: ${utf8Subject}`,
+    messageId ? `In-Reply-To: ${messageId}` : '',
+    messageId ? `References: ${messageId}` : '',
+    'MIME-Version: 1.0',
+    'Content-Type: text/html; charset="UTF-8"',
+    '',
+    htmlBody
+  ].filter(Boolean);
+
+  const raw = Buffer.from(headers.join('\r\n'))
+    .toString('base64')
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_')
+    .replace(/=+$/, '');
+
+  await gmail.users.messages.send({
+    userId: 'me',
+    requestBody: { raw, threadId }
+  });
+}
+
 module.exports = {
   getGmailClient,
   sendGmailReply,
diff --git a/services/staffSignature.js b/services/staffSignature.js
new file mode 100644
index 0000000..fb972f0
--- /dev/null
+++ b/services/staffSignature.js
@@ -0,0 +1,25 @@
+const { mongoose } = require('../db-connection');
+
+/**
+ * Returns { text, html } for a staff member's signature.
+ * Returns { text: '', html: '' } if no signature is set.
+ */
+async function getStaffSignatureBlocks(userId) {
+  const StaffSignature = mongoose.model('StaffSignature');
+  const sig = await StaffSignature.findOne({ userId }).lean();
+  if (!sig || (!sig.valediction && !sig.displayName && !sig.tagline)) {
+    return { text: '', html: '' };
+  }
+
+  const lines = [];
+  if (sig.valediction) lines.push(sig.valediction);
+  if (sig.displayName) lines.push(sig.displayName);
+  if (sig.tagline) lines.push(sig.tagline);
+
+  const text = lines.join('\n');
+  const html = lines.map(l => `<div>${l}</div>`).join('');
+
+  return { text, html };
+}
+
+module.exports = { getStaffSignatureBlocks };
\ No newline at end of file