diff --git a/src/modules/email/email.service.ts b/src/modules/email/email.service.ts
index 705f1ca..f422d9d 100644
--- a/src/modules/email/email.service.ts
+++ b/src/modules/email/email.service.ts
@@ -12,6 +12,7 @@ import type {
   EmailListResponse,
   EmailSummary,
   ListEmails,
+  MailQuota,
   Mailbox,
   MailboxType,
   SearchEmailDto,
@@ -162,4 +163,8 @@ export class EmailService {
   ): Promise<DownloadAttachmentResponse> {
     return this.mail.downloadAttachment(payload);
   }
+
+  getQuota(userEmail: string): Promise<MailQuota> {
+    return this.mail.getQuota(userEmail);
+  }
 }
diff --git a/src/modules/email/email.types.ts b/src/modules/email/email.types.ts
index 1fb3525..c9c76c6 100644
--- a/src/modules/email/email.types.ts
+++ b/src/modules/email/email.types.ts
@@ -123,3 +123,8 @@ export interface SearchEmailFilter {
   unread?: boolean;
   hasAttachment?: boolean;
 }
+
+export interface MailQuota {
+  used: number;
+  limit: number;
+}
diff --git a/src/modules/email/mail-provider.port.ts b/src/modules/email/mail-provider.port.ts
index a0a7053..b140357 100644
--- a/src/modules/email/mail-provider.port.ts
+++ b/src/modules/email/mail-provider.port.ts
@@ -9,6 +9,7 @@ import type {
   Email,
   EmailListResponse,
   ListEmails,
+  MailQuota,
   Mailbox,
   MailboxType,
   SearchEmailDto,
@@ -54,4 +55,5 @@ export abstract class MailProvider {
   abstract downloadAttachment(
     payload: DownloadAttachmentPayload,
   ): Promise<DownloadAttachmentResponse>;
+  abstract getQuota(userEmail: string): Promise<MailQuota>;
 }
diff --git a/src/modules/infrastructure/jmap/jmap-mail.provider.spec.ts b/src/modules/infrastructure/jmap/jmap-mail.provider.spec.ts
index 74488e2..8c2a4f9 100644
--- a/src/modules/infrastructure/jmap/jmap-mail.provider.spec.ts
+++ b/src/modules/infrastructure/jmap/jmap-mail.provider.spec.ts
@@ -8,6 +8,7 @@ import {
   newJmapMailbox,
   newJmapEmail,
   newJmapIdentity,
+  newJmapQuota,
   newSendEmailDto,
   newDraftEmailDto,
 } from '../../../../test/fixtures.js';
@@ -584,4 +585,34 @@ describe('JmapMailProvider', () => {
       expect(result).toBe(stored);
     });
   });
+
+  describe('getQuota', () => {
+    it('when quota exists, then returns used and limit from octets quota', async () => {
+      const quota = newJmapQuota({ used: 500_000, hardLimit: 1_000_000 });
+      jmapService.request.mockResolvedValue(jmapResponse({ list: [quota] }));
+
+      const result = await provider.getQuota('user@test.com');
+
+      expect(result).toEqual({ used: 500_000, limit: 1_000_000 });
+    });
+
+    it('when no octets quota exists, then returns zeros', async () => {
+      const nonOctetsQuota = newJmapQuota({ resourceType: 'count' });
+      jmapService.request.mockResolvedValue(
+        jmapResponse({ list: [nonOctetsQuota] }),
+      );
+
+      const result = await provider.getQuota('user@test.com');
+
+      expect(result).toEqual({ used: 0, limit: 0 });
+    });
+
+    it('when quota list is empty, then returns zeros', async () => {
+      jmapService.request.mockResolvedValue(jmapResponse({ list: [] }));
+
+      const result = await provider.getQuota('user@test.com');
+
+      expect(result).toEqual({ used: 0, limit: 0 });
+    });
+  });
 });
diff --git a/src/modules/infrastructure/jmap/jmap-mail.provider.ts b/src/modules/infrastructure/jmap/jmap-mail.provider.ts
index fb7282a..db78600 100644
--- a/src/modules/infrastructure/jmap/jmap-mail.provider.ts
+++ b/src/modules/infrastructure/jmap/jmap-mail.provider.ts
@@ -5,17 +5,19 @@ import type {
   Email,
   EmailListResponse,
   ListEmails,
+  MailQuota,
   Mailbox,
   MailboxType,
   SearchEmailFilter,
   SendEmailDto,
 } from '../../email/email.types.js';
-import { JmapService } from './jmap.service.js';
+import { JMAP_QUOTA_CAPABILITIES, JmapService } from './jmap.service.js';
 import type {
   DownloadAttachmentPayload,
   DownloadAttachmentResponse,
   Email as JmapEmail,
   Identity,
+  JmapQuota,
   Mailbox as JmapMailbox,
   JmapGetResponse,
   JmapQueryResponse,
@@ -442,6 +444,24 @@ export class JmapMailProvider extends MailProvider {
     return this.jmap.downloadAttachment(payload);
   }
 
+  async getQuota(userEmail: string): Promise<MailQuota> {
+    const accountId = await this.jmap.getPrimaryAccountId(userEmail);
+
+    const response = await this.jmap.request<JmapGetResponse<JmapQuota>>(
+      userEmail,
+      [['Quota/get', { accountId }, 'r0']],
+      JMAP_QUOTA_CAPABILITIES,
+    );
+
+    const quotas = response.methodResponses[0]![1].list;
+    const bytesQuota = quotas.find((q) => q.resourceType === 'octets');
+
+    return {
+      used: bytesQuota?.used ?? 0,
+      limit: bytesQuota?.hardLimit ?? 0,
+    };
+  }
+
   private async setKeyword(
     userEmail: string,
     id: string,
diff --git a/src/modules/infrastructure/jmap/jmap.service.ts b/src/modules/infrastructure/jmap/jmap.service.ts
index b31c405..242ed29 100644
--- a/src/modules/infrastructure/jmap/jmap.service.ts
+++ b/src/modules/infrastructure/jmap/jmap.service.ts
@@ -23,6 +23,7 @@ import type {
 const JMAP_CAPABILITY_CORE = 'urn:ietf:params:jmap:core';
 const JMAP_CAPABILITY_MAIL = 'urn:ietf:params:jmap:mail';
 const JMAP_CAPABILITY_SUBMISSION = 'urn:ietf:params:jmap:submission';
+export const JMAP_CAPABILITY_QUOTA = 'urn:ietf:params:jmap:quota';
 
 const JMAP_MAIL_CAPABILITIES = [
   JMAP_CAPABILITY_CORE,
@@ -30,6 +31,11 @@ const JMAP_MAIL_CAPABILITIES = [
   JMAP_CAPABILITY_SUBMISSION,
 ] as const;
 
+export const JMAP_QUOTA_CAPABILITIES = [
+  JMAP_CAPABILITY_CORE,
+  JMAP_CAPABILITY_QUOTA,
+] as const;
+
 const SESSION_TTL_MS = 30_000;
 
 interface CachedSession {
diff --git a/src/modules/infrastructure/jmap/jmap.types.ts b/src/modules/infrastructure/jmap/jmap.types.ts
index c051ab0..5fd441a 100644
--- a/src/modules/infrastructure/jmap/jmap.types.ts
+++ b/src/modules/infrastructure/jmap/jmap.types.ts
@@ -242,3 +242,15 @@ export interface DeliveryStatus {
   delivered: 'queued' | 'yes' | 'no' | 'unknown';
   displayed: 'yes' | 'unknown';
 }
+
+export interface JmapQuota {
+  id: ID;
+  resourceType: string;
+  used: number;
+  hardLimit: number;
+  scope: string;
+  name: string;
+  description?: string;
+  warnLimit?: number;
+  softLimit?: number;
+}
diff --git a/test/fixtures.ts b/test/fixtures.ts
index 5884ba6..5cd950e 100644
--- a/test/fixtures.ts
+++ b/test/fixtures.ts
@@ -33,8 +33,10 @@ import type {
   EmailAddress as JmapEmailAddress,
   MailboxRole,
   Identity,
+  JmapQuota,
 } from '../src/modules/infrastructure/jmap/jmap.types.js';
 import type { DeepMocked } from '@golevelup/ts-vitest';
+import type { MailQuota } from '../src/modules/email/email.types.js';
 
 export type DeepPartial<T> =
   T extends Array<infer U>
@@ -379,3 +381,23 @@ export function newSearchEmailDto(
     ...attrs,
   };
 }
+
+export function newJmapQuota(attrs?: Partial<JmapQuota>): JmapQuota {
+  return {
+    id: randomId(),
+    resourceType: 'octets',
+    used: random.natural({ min: 0, max: 1_000_000_000 }),
+    hardLimit: random.natural({ min: 1_000_000_000, max: 10_000_000_000 }),
+    scope: 'account',
+    name: 'Mail storage',
+    ...attrs,
+  };
+}
+
+export function newMailQuota(attrs?: Partial<MailQuota>): MailQuota {
+  return {
+    used: random.natural({ min: 0, max: 1_000_000_000 }),
+    limit: random.natural({ min: 1_000_000_000, max: 10_000_000_000 }),
+    ...attrs,
+  };
+}