[vchkpw] relay, smtp after pop

[Andrew Simon]

I am running qmail/courier-map/vpopmail 5.4.2 system. It is working well. However occassionally users get the   "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"   Its not all the time. They are outside the office when this happens. I am using smtp after pop. All the settings are correct as far as I know. Any input would be helpful.   Andrew