This may or may not be limited to one or all xtra smtp servers but it is happening.
In NZ this means emails to orcon and maxnet are both being denied. I haven't bothered figuring out who else this affects.
Xtra were first listed in Nov last year, got off the list and then let their staff send spam from internal (ie there's something coming email) and failed to do anything about it when told about it. Sorbs blacklisted them Mar 3rd (US time) and Xtra failed to do anything about it. Thus xtra is now blacklisted again.
Xtras advanced support team (CFT, CTS .. whatever acronym they are using) know about it but are not issuing an advisory as they don't want word getting out. They had known about it for 48 hours on Monday. Considering this kind of thing is normally resolved within 12-24 the question had to be why has it taken over 48 and why is it not fixed? They are trying to catch the internal spammers or something like that ( well duh!!! i sent you an email on the 27th of Feb telling you what PC and at what time and what server it came out of .. what more do you need?) and don't seem to be giving a rats rectum for their poor long suffering customers.
I will be requesting compensation (and I don't just mean a refund either) on behalf of my business and customers for the inconvenience lost productivity and lost income this is causing.
Xtra ... you guys suck the big one. I am not a swearing man but you sons of a retarded sloth are pushing all my buttons right to the limit.