diff --git a/app/controllers/collections_controller.rb b/app/controllers/collections_controller.rb
index 0b93d0d29..ad1c31cb4 100644
--- a/app/controllers/collections_controller.rb
+++ b/app/controllers/collections_controller.rb
@@ -94,6 +94,8 @@ def download_all
 
   def share
     if share_message.save
+      recipient = User.find_by(email: params[:user])
+      CollectionInvitationMailer.with(collection: @collection, recipient:).send_invitation.deliver_later
       redirect_to @collection, notice: t('.success_notice'), status: :see_other
     else
       redirect_to @collection, alert: share_message.errors.full_messages.join(', '), status: :see_other
diff --git a/app/mailers/collection_invitation_mailer.rb b/app/mailers/collection_invitation_mailer.rb
new file mode 100644
index 000000000..0a6012dae
--- /dev/null
+++ b/app/mailers/collection_invitation_mailer.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class CollectionInvitationMailer < ApplicationMailer
+  def send_invitation
+    @collection = params.fetch(:collection)
+    @recipient = params.fetch(:recipient)
+
+    I18n.with_locale(@recipient.preferred_locale || I18n.default_locale) do
+      mail(to: @recipient.email, subject: t('collections.invitation_mailer.subject', collection: @collection.title))
+    end
+  end
+end
diff --git a/app/views/collection_invitation_mailer/send_invitation.html.slim b/app/views/collection_invitation_mailer/send_invitation.html.slim
new file mode 100644
index 000000000..f81d82f2c
--- /dev/null
+++ b/app/views/collection_invitation_mailer/send_invitation.html.slim
@@ -0,0 +1,9 @@
+
+h3 = t('collections.invitation_mailer.greeting', user: @recipient.name)
+p = t('collections.invitation_mailer.invitation_message', collection: @collection.title)
+p = t('collections.invitation_mailer.collaboration_details')
+p = t('collections.invitation_mailer.view_collection_instructions')
+p = link_to t('collections.invitation_mailer.view_collection'), collection_url(@collection)
+p = t('collections.invitation_mailer.contact_info')
+p = t('collections.invitation_mailer.thank_you')
+p = t('collections.invitation_mailer.team_signature', app_name: t('application.name'))
diff --git a/app/views/collection_invitation_mailer/send_invitation.text.slim b/app/views/collection_invitation_mailer/send_invitation.text.slim
new file mode 100644
index 000000000..58d360010
--- /dev/null
+++ b/app/views/collection_invitation_mailer/send_invitation.text.slim
@@ -0,0 +1,13 @@
+= t('collections.invitation_mailer.greeting', user: @recipient.name)
+
+= t('collections.invitation_mailer.invitation_message', collection: @collection.title)
+
+= t('collections.invitation_mailer.collaboration_details')
+
+= t('collections.invitation_mailer.view_collection_instructions')
+= collection_url(@collection)
+
+= t('collections.invitation_mailer.contact_info')
+
+= t('collections.invitation_mailer.thank_you')
+= t('collections.invitation_mailer.team_signature', app_name: t('application.name'))
diff --git a/config/locales/de/views/application.yml b/config/locales/de/views/application.yml
index 692084592..ce7cb606b 100644
--- a/config/locales/de/views/application.yml
+++ b/config/locales/de/views/application.yml
@@ -16,6 +16,7 @@ de:
     markdown_editor:
       collapse: Editor zuklappen
       expand: Editor aufklappen
+    name: CodeHarbor
     navigation:
       rails_admin: Rails Admin
     session:
diff --git a/config/locales/de/views/collections.yml b/config/locales/de/views/collections.yml
index ee637c159..c8309f4c7 100644
--- a/config/locales/de/views/collections.yml
+++ b/config/locales/de/views/collections.yml
@@ -18,6 +18,16 @@ de:
         mine: Meine Sammlungen
         public: Öffentliche Sammlungen
       view_shared: Geteilte Sammlung anzeigen
+    invitation_mailer:
+      collaboration_details: Diese Zusammenarbeit ermöglicht es Ihnen, zum Inhalt dieser Sammlung beizutragen und bei der Verwaltung zu helfen.
+      contact_info: Wenn Sie Fragen zu dieser Einladung oder Ihrer Rolle als Mitarbeiter haben, wenden Sie sich bitte direkt an den Besitzer der Sammlung.
+      greeting: Hallo %{user},
+      invitation_message: Sie wurden eingeladen, an der Sammlung "%{collection}" mitzuarbeiten.
+      subject: 'Einladung zur Sammlung: %{collection}'
+      team_signature: "%{app_name} Team"
+      thank_you: Vielen Dank,
+      view_collection: Sammlung anzeigen
+      view_collection_instructions: 'Um die Sammlung anzuzeigen und mit Ihrer Zusammenarbeit zu beginnen, klicken Sie auf den Link unten:'
     new:
       header: Neue Sammlung
     shared:
diff --git a/config/locales/en/views/application.yml b/config/locales/en/views/application.yml
index abddf891d..bc797d490 100644
--- a/config/locales/en/views/application.yml
+++ b/config/locales/en/views/application.yml
@@ -16,6 +16,7 @@ en:
     markdown_editor:
       collapse: Collapse editor
       expand: Expand editor
+    name: CodeHarbor
     navigation:
       rails_admin: Rails admin
     session:
diff --git a/config/locales/en/views/collections.yml b/config/locales/en/views/collections.yml
index cb1eb0371..0c29be47f 100644
--- a/config/locales/en/views/collections.yml
+++ b/config/locales/en/views/collections.yml
@@ -18,6 +18,16 @@ en:
         mine: My Collections
         public: Public Collections
       view_shared: View Shared Collection
+    invitation_mailer:
+      collaboration_details: This collaboration will allow you to contribute to and help manage this collection's content.
+      contact_info: If you have any questions about this invitation or your role as a collaborator, please contact the collection owner directly.
+      greeting: Hi %{user},
+      invitation_message: You've been invited to collaborate on the collection "%{collection}".
+      subject: 'Invitation to collection: %{collection}'
+      team_signature: "%{app_name} Team"
+      thank_you: Thank you,
+      view_collection: View collection
+      view_collection_instructions: 'To view the collection and get started with your collaboration, click the link below:'
     new:
       header: New Collection
     shared:
diff --git a/spec/controllers/collections_controller_spec.rb b/spec/controllers/collections_controller_spec.rb
index 7051f25be..68716f25b 100644
--- a/spec/controllers/collections_controller_spec.rb
+++ b/spec/controllers/collections_controller_spec.rb
@@ -440,11 +440,27 @@
     let(:params) { {id: collection.id, user: recipient.email} }
     let(:recipient) { create(:user) }
 
+    let(:mailer) { double('Mailer', send_invitation: delivery) } # rubocop:disable RSpec/VerifiedDoubles
+    let(:delivery) { instance_double(ActionMailer::MessageDelivery) }
+
+    before do
+      allow(CollectionInvitationMailer).to receive(:with).and_return(mailer)
+      allow(mailer).to receive(:send_invitation).and_return(delivery)
+      allow(delivery).to receive(:deliver_later)
+    end
+
     shared_examples 'success' do
       it 'creates a message' do
         expect { post_request }.to change(Message, :count).by(1)
       end
 
+      it 'sends an invitation email' do
+        post_request
+        expect(CollectionInvitationMailer).to have_received(:with).with({collection:, recipient:})
+        expect(mailer).to have_received(:send_invitation)
+        expect(delivery).to have_received(:deliver_later)
+      end
+
       it 'redirects to collection' do
         post_request
         expect(response).to redirect_to collection
@@ -460,6 +476,11 @@
         expect { post_request }.not_to change(Message, :count)
       end
 
+      it 'does not send an invitation email' do
+        post_request
+        expect(CollectionInvitationMailer).not_to have_received(:with)
+      end
+
       it 'redirects to collection' do
         post_request
         expect(response).to redirect_to collection
diff --git a/spec/mailers/collection_invitation_mailer_spec.rb b/spec/mailers/collection_invitation_mailer_spec.rb
new file mode 100644
index 000000000..365c1d3b6
--- /dev/null
+++ b/spec/mailers/collection_invitation_mailer_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe CollectionInvitationMailer do
+  describe '#send_invitation' do
+    subject(:invitation_email) { described_class.with(collection:, recipient: user).send_invitation }
+
+    let(:collection) { create(:collection) }
+    let(:user) { create(:user) }
+
+    it 'sends an email to the correct recipient' do
+      expect(invitation_email.to).to include(user.email)
+    end
+
+    it 'has the correct subject' do
+      expect(invitation_email.subject).to include(collection.title)
+    end
+
+    it 'contains the correct content' do
+      expect(invitation_email.body.encoded).to include(user.name)
+      expect(invitation_email.body.encoded).to include(collection.title)
+      expect(invitation_email.body.encoded).to include('collaborate')
+    end
+
+    context 'with different locales' do
+      before do
+        user.update(preferred_locale: 'de')
+      end
+
+      it 'uses the user\'s preferred locale' do
+        expect(invitation_email.body.encoded).to include('Sammlung')
+        expect(invitation_email.subject).to include('Einladung zur Sammlung')
+      end
+    end
+  end
+end
diff --git a/spec/mailers/previews/collection_invitation_mailer_preview.rb b/spec/mailers/previews/collection_invitation_mailer_preview.rb
new file mode 100644
index 000000000..6bf2291fe
--- /dev/null
+++ b/spec/mailers/previews/collection_invitation_mailer_preview.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require 'factory_bot_rails'
+
+class CollectionInvitationMailerPreview < ActionMailer::Preview
+  def send_invitation
+    collection = FactoryBot.build(:collection, id: 1)
+    user = FactoryBot.build(:user, id: 2)
+    CollectionInvitationMailer.send_invitation(collection, user)
+  end
+end