diff --git a/app/controllers/api/v1/reports_controller.rb b/app/controllers/api/v1/reports_controller.rb
index 8ff6c8fe5c..300c9faa3f 100644
--- a/app/controllers/api/v1/reports_controller.rb
+++ b/app/controllers/api/v1/reports_controller.rb
@@ -23,6 +23,6 @@ class Api::V1::ReportsController < Api::BaseController
   end
 
   def report_params
-    params.permit(:account_id, :comment, :category, :forward, status_ids: [], rule_ids: [])
+    params.permit(:account_id, :comment, :category, :forward, forward_to_domains: [], status_ids: [], rule_ids: [])
   end
 end
diff --git a/app/javascript/mastodon/features/report/comment.jsx b/app/javascript/mastodon/features/report/comment.jsx
index 4888b76bcb..98ac4caa0a 100644
--- a/app/javascript/mastodon/features/report/comment.jsx
+++ b/app/javascript/mastodon/features/report/comment.jsx
@@ -1,87 +1,121 @@
 import PropTypes from 'prop-types';
-import { PureComponent } from 'react';
+import { useCallback, useEffect, useRef } from 'react';
 
-import { injectIntl, defineMessages, FormattedMessage } from 'react-intl';
+import { useIntl, defineMessages, FormattedMessage } from 'react-intl';
+
+import { OrderedSet, List as ImmutableList } from 'immutable';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { shallowEqual } from 'react-redux';
+import { createSelector } from 'reselect';
 
 import Toggle from 'react-toggle';
 
+import { fetchAccount } from 'mastodon/actions/accounts';
 import Button from 'mastodon/components/button';
+import { useAppDispatch, useAppSelector } from 'mastodon/store';
 
 const messages = defineMessages({
   placeholder: { id: 'report.placeholder', defaultMessage: 'Type or paste additional comments' },
 });
 
-class Comment extends PureComponent {
+const selectRepliedToAccountIds = createSelector(
+  [
+    (state) => state.get('statuses'),
+    (_, statusIds) => statusIds,
+  ],
+  (statusesMap, statusIds) => statusIds.map((statusId) => statusesMap.getIn([statusId, 'in_reply_to_account_id'])),
+  {
+    resultEqualityCheck: shallowEqual,
+  }
+);
 
-  static propTypes = {
-    onSubmit: PropTypes.func.isRequired,
-    comment: PropTypes.string.isRequired,
-    onChangeComment: PropTypes.func.isRequired,
-    intl: PropTypes.object.isRequired,
-    isSubmitting: PropTypes.bool,
-    forward: PropTypes.bool,
-    isRemote: PropTypes.bool,
-    domain: PropTypes.string,
-    onChangeForward: PropTypes.func.isRequired,
-  };
+const Comment = ({ comment, domain, statusIds, isRemote, isSubmitting, selectedDomains, onSubmit, onChangeComment, onToggleDomain }) => {
+  const intl = useIntl();
 
-  handleClick = () => {
-    const { onSubmit } = this.props;
-    onSubmit();
-  };
+  const dispatch = useAppDispatch();
+  const loadedRef = useRef(false);
 
-  handleChange = e => {
-    const { onChangeComment } = this.props;
-    onChangeComment(e.target.value);
-  };
+  const handleClick = useCallback(() => onSubmit(), [onSubmit]);
+  const handleChange = useCallback((e) => onChangeComment(e.target.value), [onChangeComment]);
+  const handleToggleDomain = useCallback(e => onToggleDomain(e.target.value, e.target.checked), [onToggleDomain]);
 
-  handleKeyDown = e => {
+  const handleKeyDown = useCallback((e) => {
     if (e.keyCode === 13 && (e.ctrlKey || e.metaKey)) {
-      this.handleClick();
+      handleClick();
     }
-  };
+  }, [handleClick]);
 
-  handleForwardChange = e => {
-    const { onChangeForward } = this.props;
-    onChangeForward(e.target.checked);
-  };
+  // Memoize accountIds since we don't want it to trigger `useEffect` on each render
+  const accountIds = useAppSelector((state) => domain ? selectRepliedToAccountIds(state, statusIds) : ImmutableList());
 
-  render () {
-    const { comment, isRemote, forward, domain, isSubmitting, intl } = this.props;
+  // While we could memoize `availableDomains`, it is pretty inexpensive to recompute
+  const accountsMap = useAppSelector((state) => state.get('accounts'));
+  const availableDomains = domain ? OrderedSet([domain]).union(accountIds.map((accountId) => accountsMap.getIn([accountId, 'acct'], '').split('@')[1]).filter(domain => !!domain)) : OrderedSet();
 
-    return (
-      <>
-        <h3 className='report-dialog-modal__title'><FormattedMessage id='report.comment.title' defaultMessage='Is there anything else you think we should know?' /></h3>
+  useEffect(() => {
+    if (loadedRef.current) {
+      return;
+    }
 
-        <textarea
-          className='report-dialog-modal__textarea'
-          placeholder={intl.formatMessage(messages.placeholder)}
-          value={comment}
-          onChange={this.handleChange}
-          onKeyDown={this.handleKeyDown}
-          disabled={isSubmitting}
-        />
+    loadedRef.current = true;
 
-        {isRemote && (
-          <>
-            <p className='report-dialog-modal__lead'><FormattedMessage id='report.forward_hint' defaultMessage='The account is from another server. Send an anonymized copy of the report there as well?' /></p>
+    // First, pre-select known domains
+    availableDomains.forEach((domain) => {
+      onToggleDomain(domain, true);
+    });
 
-            <label className='report-dialog-modal__toggle'>
-              <Toggle checked={forward} disabled={isSubmitting} onChange={this.handleForwardChange} />
+    // Then, fetch missing replied-to accounts
+    const unknownAccounts = OrderedSet(accountIds.filter(accountId => accountId && !accountsMap.has(accountId)));
+    unknownAccounts.forEach((accountId) => {
+      dispatch(fetchAccount(accountId));
+    });
+  });
+
+  return (
+    <>
+      <h3 className='report-dialog-modal__title'><FormattedMessage id='report.comment.title' defaultMessage='Is there anything else you think we should know?' /></h3>
+
+      <textarea
+        className='report-dialog-modal__textarea'
+        placeholder={intl.formatMessage(messages.placeholder)}
+        value={comment}
+        onChange={handleChange}
+        onKeyDown={handleKeyDown}
+        disabled={isSubmitting}
+      />
+
+      {isRemote && (
+        <>
+          <p className='report-dialog-modal__lead'><FormattedMessage id='report.forward_hint' defaultMessage='The account is from another server. Send an anonymized copy of the report there as well?' /></p>
+
+          { availableDomains.map((domain) => (
+            <label className='report-dialog-modal__toggle' key={`toggle-${domain}`}>
+              <Toggle checked={selectedDomains.includes(domain)} disabled={isSubmitting} onChange={handleToggleDomain} value={domain} />
               <FormattedMessage id='report.forward' defaultMessage='Forward to {target}' values={{ target: domain }} />
             </label>
-          </>
-        )}
+          ))}
+        </>
+      )}
 
-        <div className='flex-spacer' />
-
-        <div className='report-dialog-modal__actions'>
-          <Button onClick={this.handleClick} disabled={isSubmitting}><FormattedMessage id='report.submit' defaultMessage='Submit report' /></Button>
-        </div>
-      </>
-    );
-  }
+      <div className='flex-spacer' />
 
+      <div className='report-dialog-modal__actions'>
+        <Button onClick={handleClick} disabled={isSubmitting}><FormattedMessage id='report.submit' defaultMessage='Submit report' /></Button>
+      </div>
+    </>
+  );
 }
 
-export default injectIntl(Comment);
+Comment.propTypes = {
+  comment: PropTypes.string.isRequired,
+  domain: PropTypes.string,
+  statusIds: ImmutablePropTypes.list.isRequired,
+  isRemote: PropTypes.bool,
+  isSubmitting: PropTypes.bool,
+  selectedDomains: ImmutablePropTypes.set.isRequired,
+  onSubmit: PropTypes.func.isRequired,
+  onChangeComment: PropTypes.func.isRequired,
+  onToggleDomain: PropTypes.func.isRequired,
+};
+
+export default Comment;
diff --git a/app/javascript/mastodon/features/ui/components/report_modal.jsx b/app/javascript/mastodon/features/ui/components/report_modal.jsx
index 9958df6180..7ed5742588 100644
--- a/app/javascript/mastodon/features/ui/components/report_modal.jsx
+++ b/app/javascript/mastodon/features/ui/components/report_modal.jsx
@@ -45,25 +45,26 @@ class ReportModal extends ImmutablePureComponent {
   state = {
     step: 'category',
     selectedStatusIds: OrderedSet(this.props.statusId ? [this.props.statusId] : []),
+    selectedDomains: OrderedSet(),
     comment: '',
     category: null,
     selectedRuleIds: OrderedSet(),
-    forward: true,
     isSubmitting: false,
     isSubmitted: false,
   };
 
   handleSubmit = () => {
     const { dispatch, accountId } = this.props;
-    const { selectedStatusIds, comment, category, selectedRuleIds, forward } = this.state;
+    const { selectedStatusIds, selectedDomains, comment, category, selectedRuleIds } = this.state;
 
     this.setState({ isSubmitting: true });
 
     dispatch(submitReport({
       account_id: accountId,
       status_ids: selectedStatusIds.toArray(),
+      selected_domains: selectedDomains.toArray(),
       comment,
-      forward,
+      forward: selectedDomains.size > 0,
       category,
       rule_ids: selectedRuleIds.toArray(),
     }, this.handleSuccess, this.handleFail));
@@ -87,13 +88,19 @@ class ReportModal extends ImmutablePureComponent {
     }
   };
 
-  handleRuleToggle = (ruleId, checked) => {
-    const { selectedRuleIds } = this.state;
-
+  handleDomainToggle = (domain, checked) => {
     if (checked) {
-      this.setState({ selectedRuleIds: selectedRuleIds.add(ruleId) });
+      this.setState((state) => ({ selectedDomains: state.selectedDomains.add(domain) }));
     } else {
-      this.setState({ selectedRuleIds: selectedRuleIds.remove(ruleId) });
+      this.setState((state) => ({ selectedDomains: state.selectedDomains.remove(domain) }));
+    }
+  };
+
+  handleRuleToggle = (ruleId, checked) => {
+    if (checked) {
+      this.setState((state) => ({ selectedRuleIds: state.selectedRuleIds.add(ruleId) }));
+    } else {
+      this.setState((state) => ({ selectedRuleIds: state.selectedRuleIds.remove(ruleId) }));
     }
   };
 
@@ -105,10 +112,6 @@ class ReportModal extends ImmutablePureComponent {
     this.setState({ comment });
   };
 
-  handleChangeForward = forward => {
-    this.setState({ forward });
-  };
-
   handleNextStep = step => {
     this.setState({ step });
   };
@@ -136,8 +139,8 @@ class ReportModal extends ImmutablePureComponent {
       step,
       selectedStatusIds,
       selectedRuleIds,
+      selectedDomains,
       comment,
-      forward,
       category,
       isSubmitting,
       isSubmitted,
@@ -185,10 +188,11 @@ class ReportModal extends ImmutablePureComponent {
           isSubmitting={isSubmitting}
           isRemote={isRemote}
           comment={comment}
-          forward={forward}
           domain={domain}
           onChangeComment={this.handleChangeComment}
-          onChangeForward={this.handleChangeForward}
+          statusIds={selectedStatusIds}
+          selectedDomains={selectedDomains}
+          onToggleDomain={this.handleDomainToggle}
         />
       );
       break;
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 0d816ba8d8..c1249fe718 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -5784,6 +5784,7 @@ a.status-card.compact:hover {
   &__toggle {
     display: flex;
     align-items: center;
+    margin-bottom: 10px;
 
     & > span {
       font-size: 17px;
diff --git a/app/services/report_service.rb b/app/services/report_service.rb
index 39ebd5cd8a..22d788d543 100644
--- a/app/services/report_service.rb
+++ b/app/services/report_service.rb
@@ -16,7 +16,11 @@ class ReportService < BaseService
 
     create_report!
     notify_staff!
-    forward_to_origin! if forward?
+
+    if forward?
+      forward_to_origin!
+      forward_to_replied_to!
+    end
 
     @report
   end
@@ -29,7 +33,7 @@ class ReportService < BaseService
       status_ids: reported_status_ids,
       comment: @comment,
       uri: @options[:uri],
-      forwarded: forward?,
+      forwarded: forward_to_origin?,
       category: @category,
       rule_ids: @rule_ids
     )
@@ -45,11 +49,15 @@ class ReportService < BaseService
   end
 
   def forward_to_origin!
+    return unless forward_to_origin?
+
     # Send report to the server where the account originates from
     ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, @target_account.inbox_url)
+  end
 
+  def forward_to_replied_to!
     # Send report to servers to which the account was replying to, so they also have a chance to act
-    inbox_urls = Account.remote.where(id: Status.where(id: reported_status_ids).where.not(in_reply_to_account_id: nil).select(:in_reply_to_account_id)).inboxes - [@target_account.inbox_url]
+    inbox_urls = Account.remote.where(domain: forward_to_domains).where(id: Status.where(id: reported_status_ids).where.not(in_reply_to_account_id: nil).select(:in_reply_to_account_id)).inboxes - [@target_account.inbox_url]
 
     inbox_urls.each do |inbox_url|
       ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
@@ -60,6 +68,14 @@ class ReportService < BaseService
     !@target_account.local? && ActiveModel::Type::Boolean.new.cast(@options[:forward])
   end
 
+  def forward_to_origin?
+    forward? && forward_to_domains.include?(@target_account.domain)
+  end
+
+  def forward_to_domains
+    @forward_to_domains ||= (@options[:forward_to_domains] || [@target_account.domain]).filter_map { |domain| TagManager.instance.normalize_domain(domain&.strip) }.uniq
+  end
+
   def reported_status_ids
     return AccountStatusesFilter.new(@target_account, @source_account).results.with_discarded.find(Array(@status_ids)).pluck(:id) if @source_account.local?
 
diff --git a/spec/services/report_service_spec.rb b/spec/services/report_service_spec.rb
index 660ce3db23..616368bf48 100644
--- a/spec/services/report_service_spec.rb
+++ b/spec/services/report_service_spec.rb
@@ -44,9 +44,27 @@ RSpec.describe ReportService, type: :service do
           stub_request(:post, 'http://foo.com/inbox').to_return(status: 200)
         end
 
-        it 'sends ActivityPub payload to the author of the replied-to post' do
-          subject.call(source_account, remote_account, status_ids: [reported_status.id], forward: forward)
-          expect(a_request(:post, 'http://foo.com/inbox')).to have_been_made
+        context 'when forward_to_domains includes both the replied-to domain and the origin domain' do
+          it 'sends ActivityPub payload to both the author of the replied-to post and the reported user' do
+            subject.call(source_account, remote_account, status_ids: [reported_status.id], forward: forward, forward_to_domains: [remote_account.domain, remote_thread_account.domain])
+            expect(a_request(:post, 'http://foo.com/inbox')).to have_been_made
+            expect(a_request(:post, 'http://example.com/inbox')).to have_been_made
+          end
+        end
+
+        context 'when forward_to_domains includes only the replied-to domain' do
+          it 'sends ActivityPub payload only to the author of the replied-to post' do
+            subject.call(source_account, remote_account, status_ids: [reported_status.id], forward: forward, forward_to_domains: [remote_thread_account.domain])
+            expect(a_request(:post, 'http://foo.com/inbox')).to have_been_made
+            expect(a_request(:post, 'http://example.com/inbox')).to_not have_been_made
+          end
+        end
+
+        context 'when forward_to_domains does not include the replied-to domain' do
+          it 'does not send ActivityPub payload to the author of the replied-to post' do
+            subject.call(source_account, remote_account, status_ids: [reported_status.id], forward: forward)
+            expect(a_request(:post, 'http://foo.com/inbox')).to_not have_been_made
+          end
         end
       end
     end