At 20:32 07/08/2003 Tuesday, Michael Shannon wrote: >Contact the administrators of mail.dlhost.com to find out why. I sometimes >find that the refusing domain is actually a secondary MX (because the >primary was offline or unavailable) and they either aren't aware that >they're secondary (nobody told them) or they stopped relaying a long time >ago and didn't update DNS. Mike is right -- I see these kinds of intermittent errors more often after the "normal' work day. I've never met a secondary MX host that I "liked." ;-) BTW, sometimes this error is due to a non-existent mailbox (for whatever reason, sometimes due to authorization checking).