diff --git a/ghost/members-api/lib/repositories/MemberRepository.js b/ghost/members-api/lib/repositories/MemberRepository.js
index 3019f331e5..0065f36658 100644
--- a/ghost/members-api/lib/repositories/MemberRepository.js
+++ b/ghost/members-api/lib/repositories/MemberRepository.js
@@ -19,7 +19,7 @@ const messages = {
     bulkActionRequiresFilter: 'Cannot perform {action} without a filter or all=true',
     tierArchived: 'Cannot use archived Tiers',
     invalidEmail: 'Invalid Email',
-    invalidNewsletterId: 'Cannot subscribe to invalid newsletter {id}'
+    invalidNewsletterId: 'Cannot subscribe to invalid newsletter {ids}'
 };
 
 /**
@@ -284,13 +284,19 @@ module.exports = class MemberRepository {
 
         //checks for custom signUp forms
         if (memberData.newsletters && memberData.newsletters.length > 0) {
-            const savedNewsletter = await this._newslettersService.browse({filter: `id:'${memberData.newsletters[0].id}'`});
-            if (savedNewsletter.length === 0) {
-                throw new errors.BadRequestError({message: tpl(messages.invalidNewsletterId, {id: memberData.newsletters[0].id})});
-            }
-            if (savedNewsletter[0].status === 'archived') {
-                memberData.newsletters = [];
+            const newsletterIds = memberData.newsletters.map(newsletter => newsletter.id);
+            const newsletters = await this._newslettersService.browse({
+                filter: `id:[${newsletterIds}]`,
+                columns: ['id','status']
+            });
+            if (newsletters.length !== newsletterIds.length) {
+                const validNewsletterIds = newsletters.map(newsletter => newsletter.id);
+                const invalidIds = newsletterIds.filter(id => !validNewsletterIds.includes(id));
+                throw new errors.BadRequestError({message: tpl(messages.invalidNewsletterId, {ids: invalidIds})});
             }
+            memberData.newsletters = newsletters
+                .filter(newsletter => newsletter.status === 'active')
+                .map(newsletter => ({id: newsletter.id}));
         }
 
         // Subscribe members to default newsletters
diff --git a/ghost/members-api/test/unit/lib/repositories/member.test.js b/ghost/members-api/test/unit/lib/repositories/member.test.js
index 35b639013b..37d4e0a4ca 100644
--- a/ghost/members-api/test/unit/lib/repositories/member.test.js
+++ b/ghost/members-api/test/unit/lib/repositories/member.test.js
@@ -337,17 +337,27 @@ describe('MemberRepository', function () {
             };
         });
 
-        it('subscribes a member to a specified newsletter', async function () {
-            const newsletter = {
+        it('subscribes a member to the specified newsletters', async function () {
+            const newsletters = [{
                 id: 'abc123',
                 status: 'active'
-            };
+            },
+            {
+                id: 'def456',
+                status: 'active'
+            },
+            {
+                id: 'ghi789',
+                status: 'active'
+            }];
 
+            const newsletterIds = newsletters.map(newsletter => newsletter.id);
             newslettersServiceStub.browse
                 .withArgs({
-                    filter: `id:'${newsletter.id}'`
+                    filter: `id:[${newsletterIds}]`,
+                    columns: ['id', 'status']
                 })
-                .resolves([newsletter]);
+                .resolves(newsletters);
 
             const repo = new MemberRepository({
                 Member: memberModelStub,
@@ -364,14 +374,18 @@ describe('MemberRepository', function () {
                 email: 'jamie@example.com',
                 email_disabled: false,
                 newsletters: [
-                    {id: newsletter.id}
+                    {id: newsletters[0].id},
+                    {id: newsletters[1].id},
+                    {id: newsletters[2].id}
                 ]
             });
 
             newslettersServiceStub.browse.calledOnce.should.be.true();
             memberModelStub.add.calledOnce.should.be.true();
             memberModelStub.add.args[0][0].newsletters.should.eql([
-                {id: newsletter.id}
+                {id: newsletters[0].id},
+                {id: newsletters[1].id},
+                {id: newsletters[2].id}
             ]);
         });
 
@@ -380,7 +394,8 @@ describe('MemberRepository', function () {
 
             newslettersServiceStub.browse
                 .withArgs({
-                    filter: `id:'${INVALID_NEWSLETTER_ID}'`
+                    filter: `id:[${INVALID_NEWSLETTER_ID}]`,
+                    columns: ['id', 'status']
                 })
                 .resolves([]);
 
@@ -412,7 +427,8 @@ describe('MemberRepository', function () {
 
             newslettersServiceStub.browse
                 .withArgs({
-                    filter: `id:'${newsletter.id}'`
+                    filter: `id:[${newsletter.id}]`,
+                    columns: ['id', 'status']
                 })
                 .resolves([newsletter]);