diff --git a/src/MessageQuery.php b/src/MessageQuery.php
index c807299..9b0da14 100644
--- a/src/MessageQuery.php
+++ b/src/MessageQuery.php
@@ -2,6 +2,7 @@
 
 namespace DirectoryTree\ImapEngine;
 
+use BackedEnum;
 use DirectoryTree\ImapEngine\Collections\MessageCollection;
 use DirectoryTree\ImapEngine\Collections\ResponseCollection;
 use DirectoryTree\ImapEngine\Connection\ConnectionInterface;
@@ -211,6 +212,106 @@ public function destroy(array|int $uids, bool $expunge = false): void
         }
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function flag(BackedEnum|string $flag, string $operation, bool $expunge = false): int
+    {
+        $uids = $this->search()->all();
+
+        if (empty($uids)) {
+            return 0;
+        }
+
+        $this->connection()->store(
+            (array) Str::enums($flag),
+            $uids,
+            mode: $operation
+        );
+
+        if ($expunge) {
+            $this->folder->expunge();
+        }
+
+        return count($uids);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markRead(): int
+    {
+        return $this->flag(ImapFlag::Seen, '+');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markUnread(): int
+    {
+        return $this->flag(ImapFlag::Seen, '-');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markFlagged(): int
+    {
+        return $this->flag(ImapFlag::Flagged, '+');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function unmarkFlagged(): int
+    {
+        return $this->flag(ImapFlag::Flagged, '-');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function delete(bool $expunge = false): int
+    {
+        return $this->flag(ImapFlag::Deleted, '+', $expunge);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function move(string $folder, bool $expunge = false): int
+    {
+        $uids = $this->search()->all();
+
+        if (empty($uids)) {
+            return 0;
+        }
+
+        $this->connection()->move($folder, $uids);
+
+        if ($expunge) {
+            $this->folder->expunge();
+        }
+
+        return count($uids);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function copy(string $folder): int
+    {
+        $uids = $this->search()->all();
+
+        if (empty($uids)) {
+            return 0;
+        }
+
+        $this->connection()->copy($folder, $uids);
+
+        return count($uids);
+    }
+
     /**
      * Process the collection of messages.
      */
diff --git a/src/MessageQueryInterface.php b/src/MessageQueryInterface.php
index a2a2d41..7338ea0 100644
--- a/src/MessageQueryInterface.php
+++ b/src/MessageQueryInterface.php
@@ -2,6 +2,7 @@
 
 namespace DirectoryTree\ImapEngine;
 
+use BackedEnum;
 use DirectoryTree\ImapEngine\Collections\MessageCollection;
 use DirectoryTree\ImapEngine\Enums\ImapFetchIdentifier;
 use DirectoryTree\ImapEngine\Pagination\LengthAwarePaginator;
@@ -205,4 +206,61 @@ public function find(int $id, ImapFetchIdentifier $identifier = ImapFetchIdentif
      * Destroy the given messages.
      */
     public function destroy(array|int $uids, bool $expunge = false): void;
+
+    /**
+     * Add or remove a flag from all messages matching the current query.
+     *
+     * @param  string  $operation  '+'|'-'
+     * @return int The number of messages affected.
+     */
+    public function flag(BackedEnum|string $flag, string $operation, bool $expunge = false): int;
+
+    /**
+     * Mark all messages matching the current query as read.
+     *
+     * @return int The number of messages affected.
+     */
+    public function markRead(): int;
+
+    /**
+     * Mark all messages matching the current query as unread.
+     *
+     * @return int The number of messages affected.
+     */
+    public function markUnread(): int;
+
+    /**
+     * Mark all messages matching the current query as flagged.
+     *
+     * @return int The number of messages affected.
+     */
+    public function markFlagged(): int;
+
+    /**
+     * Unmark all messages matching the current query as flagged.
+     *
+     * @return int The number of messages affected.
+     */
+    public function unmarkFlagged(): int;
+
+    /**
+     * Delete all messages matching the current query.
+     *
+     * @return int The number of messages affected.
+     */
+    public function delete(bool $expunge = false): int;
+
+    /**
+     * Move all messages matching the current query to the given folder.
+     *
+     * @return int The number of messages affected.
+     */
+    public function move(string $folder, bool $expunge = false): int;
+
+    /**
+     * Copy all messages matching the current query to the given folder.
+     *
+     * @return int The number of messages affected.
+     */
+    public function copy(string $folder): int;
 }
diff --git a/src/Testing/FakeMessageQuery.php b/src/Testing/FakeMessageQuery.php
index cc0146c..bcabbee 100644
--- a/src/Testing/FakeMessageQuery.php
+++ b/src/Testing/FakeMessageQuery.php
@@ -2,6 +2,7 @@
 
 namespace DirectoryTree\ImapEngine\Testing;
 
+use BackedEnum;
 use DirectoryTree\ImapEngine\Collections\MessageCollection;
 use DirectoryTree\ImapEngine\Connection\ImapQueryBuilder;
 use DirectoryTree\ImapEngine\Enums\ImapFetchIdentifier;
@@ -154,4 +155,72 @@ public function destroy(array|int $uids, bool $expunge = false): void
             $messages->values()->all()
         );
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function flag(BackedEnum|string $flag, string $operation, bool $expunge = false): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markRead(): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markUnread(): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function markFlagged(): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function unmarkFlagged(): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function delete(bool $expunge = false): int
+    {
+        $count = count($this->folder->getMessages());
+
+        $this->folder->setMessages([]);
+
+        return $count;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function move(string $folder, bool $expunge = false): int
+    {
+        return count($this->folder->getMessages());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function copy(string $folder): int
+    {
+        return count($this->folder->getMessages());
+    }
 }
diff --git a/tests/Unit/MessageQueryTest.php b/tests/Unit/MessageQueryTest.php
index 517145a..16dc948 100644
--- a/tests/Unit/MessageQueryTest.php
+++ b/tests/Unit/MessageQueryTest.php
@@ -204,3 +204,275 @@ function query(?Mailbox $mailbox = null): MessageQuery
     expect($uid)->toBe(1);
     $stream->assertWritten('TAG2 APPEND "INBOX" (\\Seen) "Hello world"');
 })->with([ImapFlag::Seen, '\\Seen']);
+
+test('flag adds flag to all matching messages', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2 3',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->flag(ImapFlag::Seen, '+');
+
+    expect($count)->toBe(3);
+    $stream->assertWritten('TAG3 UID STORE 1,2,3 +FLAGS.SILENT (\Seen)');
+});
+
+test('flag removes flag from all matching messages', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 4 5',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->flag(ImapFlag::Flagged, '-');
+
+    expect($count)->toBe(2);
+    $stream->assertWritten('TAG3 UID STORE 4,5 -FLAGS.SILENT (\Flagged)');
+});
+
+test('flag returns zero when no messages match', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH',
+        'TAG2 OK SEARCH completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->flag(ImapFlag::Seen, '+');
+
+    expect($count)->toBe(0);
+});
+
+test('markRead marks all matching messages as read', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2 3',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->markRead();
+
+    expect($count)->toBe(3);
+    $stream->assertWritten('TAG3 UID STORE 1,2,3 +FLAGS.SILENT (\Seen)');
+});
+
+test('markUnread marks all matching messages as unread', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->markUnread();
+
+    expect($count)->toBe(2);
+    $stream->assertWritten('TAG3 UID STORE 1,2 -FLAGS.SILENT (\Seen)');
+});
+
+test('markFlagged flags all matching messages', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 5 6 7 8',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->markFlagged();
+
+    expect($count)->toBe(4);
+    $stream->assertWritten('TAG3 UID STORE 5,6,7,8 +FLAGS.SILENT (\Flagged)');
+});
+
+test('unmarkFlagged unflags all matching messages', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 10',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->unmarkFlagged();
+
+    expect($count)->toBe(1);
+    $stream->assertWritten('TAG3 UID STORE 10 -FLAGS.SILENT (\Flagged)');
+});
+
+test('delete marks all matching messages as deleted', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2 3',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->delete();
+
+    expect($count)->toBe(3);
+    $stream->assertWritten('TAG3 UID STORE 1,2,3 +FLAGS.SILENT (\Deleted)');
+});
+
+test('delete with expunge also expunges folder', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID STORE completed',
+        'TAG4 OK EXPUNGE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $folder = new Folder($mailbox, 'INBOX');
+    $query = new MessageQuery($folder, new ImapQueryBuilder);
+
+    $count = $query->delete(expunge: true);
+
+    expect($count)->toBe(2);
+    $stream->assertWritten('TAG3 UID STORE 1,2 +FLAGS.SILENT (\Deleted)');
+    $stream->assertWritten('TAG4 EXPUNGE');
+});
+
+test('move moves all matching messages to folder', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 1 2 3',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID MOVE completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->move('Archive');
+
+    expect($count)->toBe(3);
+    $stream->assertWritten('TAG3 UID MOVE 1,2,3 "Archive"');
+});
+
+test('move returns zero when no messages match', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH',
+        'TAG2 OK SEARCH completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->move('Archive');
+
+    expect($count)->toBe(0);
+});
+
+test('copy copies all matching messages to folder', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH 4 5',
+        'TAG2 OK SEARCH completed',
+        'TAG3 OK UID COPY completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->copy('Backup');
+
+    expect($count)->toBe(2);
+    $stream->assertWritten('TAG3 UID COPY 4,5 "Backup"');
+});
+
+test('copy returns zero when no messages match', function () {
+    $stream = new FakeStream;
+    $stream->open();
+
+    $stream->feed([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+        '* SEARCH',
+        'TAG2 OK SEARCH completed',
+    ]);
+
+    $mailbox = Mailbox::make();
+    $mailbox->connect(new ImapConnection($stream));
+
+    $count = query($mailbox)->copy('Backup');
+
+    expect($count)->toBe(0);
+});