Set explicit Message-ID in UserAction::enable()

diff --git a/wcfsetup/install/files/lib/data/user/UserAction.class.php b/wcfsetup/install/files/lib/data/user/UserAction.class.php
index f21b97c2b3b49e3b5539ee1672a7c89a74f01088..baa7a06c32b5f5fa7c5067d59d1da0757563a035 100644 (file)
--- a/wcfsetup/install/files/lib/data/user/UserAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserAction.class.php
@@ -764,6 +764,12 @@ class UserAction extends AbstractDatabaseObjectAction implements IClipboardActio
         if (empty($this->parameters['skipNotification'])) {
             foreach ($this->getObjects() as $user) {
                 $email = new Email();
+                $email->setMessageID(\sprintf(
+                    'com.woltlab.wcf.adminActivation/%d/%d/%s',
+                    $user->userID,
+                    TIME_NOW,
+                    \bin2hex(\random_bytes(8))
+                ));
                 $email->addRecipient(new UserMailbox($user->getDecoratedObject()));
                 $email->setSubject($user->getLanguage()->getDynamicVariable('wcf.acp.user.activation.mail.subject'));
                 $email->setBody(new MimePartFacade([