uschar *at = Ustrrchr(addr->address, '@');
uschar *address = string_sprintf("%.*s@%s",
(int)(at - addr->address), addr->address, domain);
uschar *at = Ustrrchr(addr->address, '@');
uschar *address = string_sprintf("%.*s@%s",
(int)(at - addr->address), addr->address, domain);