diff --git a/src/common/constants.js b/src/common/constants.js
index e9905ae..9be072b 100644
--- a/src/common/constants.js
+++ b/src/common/constants.js
@@ -189,30 +189,37 @@ module.exports = {
         added: {
           title: 'A new team member has joined your project',
           content: data => `${data.firstName} ${data.lastName} has joined project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a>. Welcome ${data.firstName}! Looking forward to working with you.`,
+          disabled: true,
         },
         managerJoined: {
           title: 'A Topcoder project manager has joined your project',
           content: data => `${data.firstName} ${data.lastName} has joined your project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a> as a project manager.`,
+          disabled: true,
         },
         copilotJoined: {
           title: 'A Topcoder copilot has joined your project',
           content: data => `${data.firstName} ${data.lastName} has joined your project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a> as a copilot.`,
+          disabled: true,
         },
         left: {
           title: 'A team member has left your project',
           content: data => `${data.firstName} ${data.lastName} has left project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a>. Thanks for all your work ${data.firstName}.`,
+          disabled: true,
         },
         removed: {
           title: 'A team member has left your project',
           content: data => `${data.firstName} ${data.lastName} has left project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a>. Thanks for all your work ${data.firstName}.`,
+          disabled: true,
         },
         ownerChanged: {
           title: 'Your project has a new owner',
           content: data => `${data.firstName} ${data.lastName} is now responsible for project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a>. Good luck ${data.firstName}.`,
+          disabled: true,
         },
         ownerAdded: {
           title: 'Ownership changed',
           content: data => `Your project has a new owner. ${data.firstName} ${data.lastName} is now responsible for project <a href="${data.projectUrl}" rel="nofollow">${data.projectName}</a>. Good luck ${data.firstName}!`,
+          disabled: true,
         },
       },
     },
diff --git a/src/handlers/memberEvents.js b/src/handlers/memberEvents.js
index e5ec2dc..4654c86 100644
--- a/src/handlers/memberEvents.js
+++ b/src/handlers/memberEvents.js
@@ -59,11 +59,13 @@ function* memberAdded(logger, data) {
     lastName: addedMember.lastName,
   };
 
-  notifications.discourse = [{
-    projectId: project.id,
-    title: topic.title,
-    content: topic.content(topicData),
-  }];
+  if (topic && !topic.disabled) {
+    notifications.discourse = [{
+      projectId: project.id,
+      title: topic.title,
+      content: topic.content(topicData),
+    }];
+  }
   return notifications;
 }
 
@@ -79,6 +81,7 @@ function* memberRemoved(logger, data) {
   ];
 
   let topic;
+  const notifications = {};
   if (data.updatedBy === data.userId) {
     // Left
     topic = constants.notifications.discourse.teamMembers.left;
@@ -93,13 +96,13 @@ function* memberRemoved(logger, data) {
     lastName: removedMember.lastName,
   };
 
-  const notifications = {
-    discourse: [{
+  if (topic && !topic.disabled) {
+    notifications.discourse = [{
       projectId: project.id,
       title: topic.title,
       content: topic.content(topicData),
-    }],
-  };
+    }];
+  }
   return notifications;
 }
 
@@ -119,6 +122,8 @@ function* memberUpdated(logger, data) {
   ];
 
   const topic = constants.notifications.discourse.teamMembers.ownerChanged;
+
+  const notifications = {};
   const topicData = {
     projectName: project.name,
     projectUrl: `https://connect.${config.get('AUTH_DOMAIN')}/projects/${project.id}/`,
@@ -126,13 +131,13 @@ function* memberUpdated(logger, data) {
     lastName: updatedMember.lastName,
   };
 
-  const notifications = {
-    discourse: [{
+  if (topic && !topic.disabled) {
+    notifications.discourse = [{
       projectId: project.id,
       title: topic.title,
       content: topic.content(topicData),
-    }],
-  };
+    }];
+  }
   return notifications;
 }
 
diff --git a/src/test/app.test.js b/src/test/app.test.js
index fec3579..fff9a5d 100644
--- a/src/test/app.test.js
+++ b/src/test/app.test.js
@@ -345,11 +345,7 @@ describe('app', () => {
     it('should create `Project.Member.ownerAdded` notification', (done) => {
       sendTestEvent(sampleEvents.memberAddedOwner, 'project.member.added');
       setTimeout(() => {
-        const expectedTitle = 'Ownership changed';
-        const expectedBody = 'Your project has a new owner. F_user L_user is now responsible for project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a>. Good luck F_user!';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -357,11 +353,7 @@ describe('app', () => {
     it('should create `Project.Member.TeamMemberAdded` notification', (done) => {
       sendTestEvent(sampleEvents.memberAddedTeamMember, 'project.member.added');
       setTimeout(() => {
-        const expectedTitle = 'A new team member has joined your project';
-        const expectedBody = 'F_user L_user has joined project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a>. Welcome F_user! Looking forward to working with you.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -369,11 +361,7 @@ describe('app', () => {
     it('should create `Project.Member.ManagerJoined` notification', (done) => {
       sendTestEvent(sampleEvents.memberAddedManager, 'project.member.added');
       setTimeout(() => {
-        const expectedTitle = 'A Topcoder project manager has joined your project';
-        const expectedBody = 'F_user L_user has joined your project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a> as a project manager.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -381,11 +369,7 @@ describe('app', () => {
     it('should create `Project.Member.CopilotJoined` notification', (done) => {
       sendTestEvent(sampleEvents.memberAddedCopilot, 'project.member.added');
       setTimeout(() => {
-        const expectedTitle = 'A Topcoder copilot has joined your project';
-        const expectedBody = 'F_user L_user has joined your project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a> as a copilot.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -399,11 +383,7 @@ describe('app', () => {
 
       sendTestEvent(sampleEvents.memberAddedCopilot, 'project.member.added');
       setTimeout(() => {
-        const expectedTitle = 'A Topcoder copilot has joined your project';
-        const expectedBody = 'F_user L_user has joined your project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">test</a> as a copilot.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         const slackParams = slackSpy.lastCall.args;
         const expectedTestCopilotNotificaton = _.cloneDeep(expectedClaimedSlackCopilotNotification);
         _.extend(expectedTestCopilotNotificaton.attachments[0], {
@@ -421,11 +401,7 @@ describe('app', () => {
     it('should create `Project.Member.Left` notification', (done) => {
       sendTestEvent(sampleEvents.memberRemovedLeft, 'project.member.removed');
       setTimeout(() => {
-        const expectedTitle = 'A team member has left your project';
-        const expectedBody = 'F_user L_user has left project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a>. Thanks for all your work F_user.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -433,11 +409,7 @@ describe('app', () => {
     it('should create `Project.Member.Removed` notification', (done) => {
       sendTestEvent(sampleEvents.memberRemovedRemoved, 'project.member.removed');
       setTimeout(() => {
-        const expectedTitle = 'A team member has left your project';
-        const expectedBody = 'F_user L_user has left project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a>. Thanks for all your work F_user.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });
@@ -447,11 +419,7 @@ describe('app', () => {
     it('should create `Project.OwnerChanged` notification', (done) => {
       sendTestEvent(sampleEvents.memberUpdated, 'project.member.updated');
       setTimeout(() => {
-        const expectedTitle = 'Your project has a new owner';
-        const expectedBody = 'F_user L_user is now responsible for project <a href="https://connect.topcoder-dev.com/projects/1/" rel="nofollow">Project name 1</a>. Good luck F_user.';
-        const params = spy.lastCall.args;
-        assert.equal(params[2], expectedTitle);
-        assert.equal(params[3], expectedBody);
+        sinon.assert.notCalled(spy);
         done();
       }, testTimeout);
     });