Ok, I'm tearing my hair out over this one because no matter whom I ask, I get a response "everything is setup correctly"
Our Exchanger server decided this morning to not want to play ball. Our outbound e-mails seem to either a) generate an NDR (shown below) or B) suffer from a 1 to 2 hour time delay before being delivered.
All of this points to the action of a spam filter (to my mind at least) but we're only blacklisted with one organisation for a tiny error (our rDNS is generic rather than domain specific)
The NDR is as follows
"You do not have permission to send to this recipient. For assistance, contact your system administrator. <81-178-1-159.dsl.pipex.com #5.7.1 smtp;550 5.7.1 Unable to relay for xxx@xxx.com>"
Basically my question is, who should I be chasing for a resolution of the problem? The guys who configured our Exchange server? Our ISP? The people who have us blacklisted?? All of them????
This shouldn't just suddenly stop working like this! We've made no changes to our setup in the last couple of months and as far as I can see, it's intermittant in the failures, there's no defining feature as to the problem


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