On Sat, 5 Jan 91 18:52:04 +0100 Eric Thomas said: >It's a problem at their site, ie *they* know how to fix it (if they >don't, they should call the software vendor). They have apparently >decided to restrict access to the internet via some exit such that >anybody can send but not everybody can receive mail. My understanding of the RFC's is that such a restriction is a distinct "no-no" under Internet rules (it's probably alright to make some accounts able to receive only, but return addresses MUST!! be valid). If the site is new on the Internet they're probably having difficulty getting the configuration to work correctly (the problem they had with bunged MX records seems to indicate they're having some problems).