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diff --git a/common/mbox-util.h b/common/mbox-util.h
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+++ b/common/mbox-util.h
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+/* mbox-util.h - Defs for mail address helper functions
+ * Copyright (C) 2015 Werner Koch
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef GNUPG_COMMON_MBOX_UTIL_H
+#define GNUPG_COMMON_MBOX_UTIL_H
+
+int has_invalid_email_chars (const void *buffer, size_t length);
+int is_valid_mailbox (const char *name);
+int is_valid_mailbox_mem (const void *buffer, size_t length);
+char *mailbox_from_userid (const char *userid);
+int is_valid_user_id (const char *uid);
+int is_valid_domain_name (const char *string);
+
+
+#endif /*GNUPG_COMMON_MBOX_UTIL_H*/