diff --git a/lib/oauth2-apps.js b/lib/oauth2-apps.js
index f2fc8eca..6366f4a2 100644
--- a/lib/oauth2-apps.js
+++ b/lib/oauth2-apps.js
@@ -101,9 +101,11 @@ function oauth2ProviderData(provider) {
     return providerData;
 }
 
-function formatExtraScopes(extraScopes, baseScopes, defaultScopesList) {
+function formatExtraScopes(extraScopes, baseScopes, defaultScopesList, skipScopes) {
     let defaultScopes;
 
+    skipScopes = [].concat(skipScopes || []);
+
     if (Array.isArray(defaultScopesList)) {
         defaultScopes = defaultScopesList;
     } else {
@@ -111,7 +113,7 @@ function formatExtraScopes(extraScopes, baseScopes, defaultScopesList) {
     }
 
     let extras = [];
-    if (!extraScopes) {
+    if (!extraScopes && !skipScopes.length) {
         return defaultScopes;
     }
 
@@ -122,11 +124,27 @@ function formatExtraScopes(extraScopes, baseScopes, defaultScopesList) {
         }
         extras.push(extraScope);
     }
+
+    let result = [];
+
     if (extras.length) {
-        return extras.concat(defaultScopes);
+        result = extras.concat(defaultScopes);
+    }
+
+    result = defaultScopes;
+
+    if (skipScopes.length) {
+        result = result.filter(scope => {
+            for (let skipScope of skipScopes) {
+                if (scope === skipScope || scope === `https://outlook.office.com/${skipScope}`) {
+                    return false;
+                }
+            }
+            return true;
+        });
     }
 
-    return defaultScopes;
+    return result;
 }
 
 class OAuth2AppsHandler {
@@ -242,6 +260,12 @@ class OAuth2AppsHandler {
         }
         extraScopes = extraScopes.filter(entry => entry);
 
+        let skipScopes = await settings.get(`${id}SkipScopes`);
+        if (!Array.isArray(skipScopes)) {
+            skipScopes = (skipScopes || '').toString().split(/[\s,]+/);
+        }
+        skipScopes = skipScopes.filter(entry => entry);
+
         switch (id) {
             case 'gmail': {
                 let appData = {
@@ -253,6 +277,7 @@ class OAuth2AppsHandler {
                     clientSecret: await settings.get(`${id}ClientSecret`),
                     redirectUrl: await settings.get(`${id}RedirectUrl`),
                     extraScopes,
+                    skipScopes,
 
                     name: 'Gmail',
                     description: 'Legacy OAuth2 app',
@@ -272,6 +297,7 @@ class OAuth2AppsHandler {
                     serviceClient: await settings.get(`${id}Client`),
                     serviceKey: await settings.get(`${id}Key`),
                     extraScopes,
+                    skipScopes,
 
                     name: 'Gmail service',
                     description: 'Legacy OAuth2 app',
@@ -296,6 +322,7 @@ class OAuth2AppsHandler {
                     clientSecret: await settings.get(`${id}ClientSecret`),
                     redirectUrl: await settings.get(`${id}RedirectUrl`),
                     extraScopes,
+                    skipScopes,
 
                     name: 'Outlook',
                     description: 'Legacy OAuth2 app',
@@ -317,6 +344,7 @@ class OAuth2AppsHandler {
                     clientSecret: await settings.get(`${id}ClientSecret`),
                     redirectUrl: await settings.get(`${id}RedirectUrl`),
                     extraScopes,
+                    skipScopes,
 
                     name: 'Mail.ru',
                     description: 'Legacy OAuth2 app',
@@ -340,7 +368,7 @@ class OAuth2AppsHandler {
 
         switch (id) {
             case 'gmail':
-                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'extraScopes']) {
+                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'extraScopes', 'skipScopes']) {
                     if (typeof updates[key] !== 'undefined') {
                         data[`${id}${key.replace(/^./, c => c.toUpperCase())}`] = updates[key];
                     }
@@ -348,13 +376,16 @@ class OAuth2AppsHandler {
                 break;
 
             case 'gmailService':
-                for (let key of ['serviceClient', 'serviceKey', 'extraScopes']) {
+                for (let key of ['serviceClient', 'serviceKey', 'extraScopes', 'skipScopes']) {
                     if (typeof updates[key] !== 'undefined') {
                         let dataKey;
                         switch (key) {
                             case 'extraScopes':
                                 dataKey = 'gmailServiceExtraScopes';
                                 break;
+                            case 'skipScopes':
+                                dataKey = 'gmailServiceSkipScopes';
+                                break;
                             default:
                                 dataKey = `gmail${key.replace(/^./, c => c.toUpperCase())}`;
                         }
@@ -364,7 +395,7 @@ class OAuth2AppsHandler {
                 break;
 
             case 'outlook':
-                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'authority', 'extraScopes']) {
+                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'authority', 'extraScopes', 'skipScopes']) {
                     if (typeof updates[key] !== 'undefined') {
                         data[`${id}${key.replace(/^./, c => c.toUpperCase())}`] = updates[key];
                     }
@@ -373,7 +404,7 @@ class OAuth2AppsHandler {
                 break;
 
             case 'mailRu':
-                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'extraScopes']) {
+                for (let key of ['clientId', 'clientSecret', 'redirectUrl', 'extraScopes', 'skipScopes']) {
                     if (typeof updates[key] !== 'undefined') {
                         data[`${id}${key.replace(/^./, c => c.toUpperCase())}`] = updates[key];
                     }
@@ -398,7 +429,7 @@ class OAuth2AppsHandler {
 
     async delLegacyApp(id) {
         let pipeline = redis.multi();
-        for (let key of ['Enabled', 'RedirectUrl', 'Client', 'ClientId', 'ClientSecret', 'Authority', 'ExtraScopes', 'Key', 'AuthFlag']) {
+        for (let key of ['Enabled', 'RedirectUrl', 'Client', 'ClientId', 'ClientSecret', 'Authority', 'ExtraScopes', 'SkipScopes', 'Key', 'AuthFlag']) {
             pipeline = pipeline.hdel(`${REDIS_PREFIX}settings`, `${id}${key}`);
         }
         await pipeline.exec();
@@ -604,7 +635,7 @@ class OAuth2AppsHandler {
                 let clientId = appData.clientId;
                 let clientSecret = appData.clientSecret ? await decrypt(appData.clientSecret) : null;
                 let redirectUrl = appData.redirectUrl;
-                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, GMAIL_SCOPES);
+                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, GMAIL_SCOPES, appData.skipScopes);
 
                 if (!clientId || !clientSecret || !redirectUrl) {
                     let error = Boom.boomify(new Error('OAuth2 credentials not set up for Gmail'), { statusCode: 400 });
@@ -638,7 +669,7 @@ class OAuth2AppsHandler {
             case 'gmailService': {
                 let serviceClient = appData.serviceClient;
                 let serviceKey = appData.serviceKey ? await decrypt(appData.serviceKey) : null;
-                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, GMAIL_SCOPES);
+                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, GMAIL_SCOPES, appData.skipScopes);
 
                 if (!serviceClient || !serviceKey) {
                     let error = Boom.boomify(new Error('OAuth2 credentials not set up for Gmail'), { statusCode: 400 });
@@ -673,7 +704,7 @@ class OAuth2AppsHandler {
                 let clientId = appData.clientId;
                 let clientSecret = appData.clientSecret ? await decrypt(appData.clientSecret) : null;
                 let redirectUrl = appData.redirectUrl;
-                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, OUTLOOK_SCOPES);
+                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, OUTLOOK_SCOPES, appData.skipScopes);
 
                 if (!clientId || !clientSecret || !authority || !redirectUrl) {
                     let error = Boom.boomify(new Error('OAuth2 credentials not set up for Outlook'), { statusCode: 400 });
@@ -709,7 +740,7 @@ class OAuth2AppsHandler {
                 let clientId = appData.clientId;
                 let clientSecret = appData.clientSecret ? await decrypt(appData.clientSecret) : null;
                 let redirectUrl = appData.redirectUrl;
-                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, MAIL_RU_SCOPES);
+                let scopes = formatExtraScopes(appData.extraScopes, appData.baseScopes, MAIL_RU_SCOPES, appData.skipScopes);
 
                 if (!clientId || !clientSecret || !redirectUrl) {
                     let error = Boom.boomify(new Error('OAuth2 credentials not set up for Mail.ru'), { statusCode: 400 });
diff --git a/lib/routes-ui.js b/lib/routes-ui.js
index e114a1ba..d4a5a590 100644
--- a/lib/routes-ui.js
+++ b/lib/routes-ui.js
@@ -337,6 +337,12 @@ const oauthUpdateSchema = {
         .max(10 * 1024)
         .description('OAuth2 Extra Scopes'),
 
+    skipScopes: Joi.string()
+        .allow('')
+        .trim()
+        .max(10 * 1024)
+        .description('OAuth2 scopes to skip from the base set'),
+
     serviceClient: Joi.string()
         .trim()
         .allow('')
@@ -2151,6 +2157,11 @@ return true;`
 
             let providerData = oauth2ProviderData(app.provider);
 
+            let disabledScopes = {};
+            if (app.skipScopes?.includes('SMTP.Send') || app.skipScopes?.includes('https://outlook.office.com/SMTP.Send')) {
+                disabledScopes.SMTP_Send = true;
+            }
+
             return h.view(
                 'config/oauth/app',
                 {
@@ -2161,6 +2172,8 @@ return true;`
 
                     app,
 
+                    disabledScopes,
+
                     providerData
                 },
                 {
@@ -2298,6 +2311,11 @@ return true;`
                     .map(scope => scope.trim())
                     .filter(scope => scope);
 
+                appData.skipScopes = appData.skipScopes
+                    .split(/\s+/)
+                    .map(scope => scope.trim())
+                    .filter(scope => scope);
+
                 let oauth2App = await oauth2Apps.create(appData);
                 if (!oauth2App || !oauth2App.id) {
                     throw new Error('Unexpected result');
@@ -2424,7 +2442,8 @@ return true;`
             let values = Object.assign({}, appData, {
                 clientSecret: '',
                 serviceKey: '',
-                extraScopes: [].concat(appData.extraScopes || []).join('\n')
+                extraScopes: [].concat(appData.extraScopes || []).join('\n'),
+                skipScopes: [].concat(appData.skipScopes || []).join('\n')
             });
 
             return h.view(
@@ -2489,6 +2508,11 @@ return true;`
                     .map(scope => scope.trim())
                     .filter(scope => scope);
 
+                updates.skipScopes = updates.skipScopes
+                    .split(/\s+/)
+                    .map(scope => scope.trim())
+                    .filter(scope => scope);
+
                 let oauth2App = await oauth2Apps.update(appData.id, updates);
                 if (!oauth2App || !oauth2App.id) {
                     throw new Error('Unexpected result');
diff --git a/lib/schemas.js b/lib/schemas.js
index 994d7900..8c40cb87 100644
--- a/lib/schemas.js
+++ b/lib/schemas.js
@@ -1135,6 +1135,18 @@ const oauthCreateSchema = {
         })
         .description('OAuth2 Extra Scopes'),
 
+    skipScopes: Joi.any()
+        .alter({
+            web: () =>
+                Joi.string()
+                    .allow('')
+                    .trim()
+                    .example('SMTP.Send')
+                    .max(10 * 1024),
+            api: () => Joi.array().items(Joi.string().trim().max(255).example('SMTP.Send'))
+        })
+        .description('OAuth2 scopes to skip from the base set'),
+
     serviceClient: Joi.string()
         .trim()
         .allow('')
diff --git a/views/config/oauth/app.hbs b/views/config/oauth/app.hbs
index 32b15086..f7cf8eeb 100644
--- a/views/config/oauth/app.hbs
+++ b/views/config/oauth/app.hbs
@@ -39,7 +39,11 @@
                 <div>Your OAuth2 project <strong>must</strong> have the following scopes enabled:</div>
                 <ul>
                     <li><code>"IMAP.AccessAsUser.All"</code>
+
+                        {{#unless disabledScopes.SMTP_Send}}
                     <li><code>"SMTP.Send"</code>
+                        {{/unless}}
+
                     <li><code>"offline_access"</code>
                 </ul>
                 <div>
@@ -191,6 +195,17 @@
             </dd>
             {{/if}}
 
+            {{#if app.skipScopes}}
+            <dt class="col-sm-3">Disabled OAuth2 scopes</dt>
+            <dd class="col-sm-9">
+                <ul>
+                    {{#each app.skipScopes}}
+                    <li class="text-monospace"><small>{{ this }}</small></li>
+                    {{/each}}
+                </ul>
+            </dd>
+            {{/if}}
+
         </dl>
 
     </div>
diff --git a/views/partials/oauth_form.hbs b/views/partials/oauth_form.hbs
index d22b56bb..b11466d7 100644
--- a/views/partials/oauth_form.hbs
+++ b/views/partials/oauth_form.hbs
@@ -277,6 +277,33 @@
                 <small class="form-text text-muted">Keep one scope per line</small>
             </div>
 
+        </div>
+    </div>
+</div>
+
+<div class="card mb-4">
+    <a href="#skipScopes" class="d-block card-header py-3 {{#unless values.skipScopes}} collapsed{{/unless}}"
+        data-toggle="collapse" role="button" aria-expanded="true" aria-controls="setupScopes">
+        <h6 class="m-0 font-weight-bold text-primary">Disabled scopes</h6>
+    </a>
+    <div class="collapse {{#if values.skipScopes}} show{{/if}}" id="skipScopes">
+        <div class="card-body">
+
+            <p>Here you can list OAuth2 scopes that EmailEngine should not use. This is mainly needed
+                when you want to disable some base scopes like <code>SMTP.Send</code> in Outlook.</p>
+
+            <div class="form-group">
+                <label for="skipScopes">List of disabled OAuth2 scopes</label>
+
+                <textarea class="form-control text-monospace {{#if errors.skipScopes}}is-invalid{{/if}}" id="skipScopes"
+                    name="skipScopes" rows="5" spellcheck="false" data-enable-grammarly="false"
+                    placeholder="Scope identifiers like &quot;SMTP.Send&quot;&mldr;">{{values.skipScopes}}</textarea>
+                {{#if errors.skipScopes}}
+                <span class="invalid-feedback">{{errors.skipScopes}}</span>
+                {{/if}}
+                <small class="form-text text-muted">Keep one scope per line</small>
+            </div>
+
         </div>
     </div>
 </div>
\ No newline at end of file
diff --git a/workers/api.js b/workers/api.js
index 37ab75a1..a4f5f893 100644
--- a/workers/api.js
+++ b/workers/api.js
@@ -6210,6 +6210,8 @@ When making API calls remember that requests against the same account are queued
 
                     extraScopes: Joi.array().items(Joi.string().trim().max(255).example('User.Read')).description('OAuth2 Extra Scopes'),
 
+                    skipScopes: Joi.array().items(Joi.string().trim().max(255).example('SMTP.Send')).description('OAuth2 scopes to skip from the base set'),
+
                     serviceClient: Joi.string()
                         .trim()
                         .allow('', null, false)