Free mailbox at exit

include/extern.h

@@ -1070,6 +1070,7 @@ E void FDECL(nocmov, (int x, int y));
 
 #ifdef MAIL
 #ifdef UNIX
+E void NDECL(free_maildata);
 E void NDECL(getmailstatus);
 E void NDECL(ck_server_admin_msg);
 #endif

src/mail.c

@@ -80,6 +80,13 @@ static long laststattime;
 #define MAILPATH "/usr/mail/"
 #endif
 
+void
+free_maildata()
+{
+    if (mailbox)
+        free(mailbox);
+}
+
 void
 getmailstatus()
 {

src/save.c

@@ -1329,6 +1329,9 @@ free_dungeons()
 void
 freedynamicdata()
 {
+#if defined(UNIX) && defined(MAIL)
+    free_maildata();
+#endif
     unload_qtlist();
     free_menu_coloring();
     free_invbuf();           /* let_to_name (invent.c) */