Not sure if this is the right forum....
I set my parents up on talktalk e-mail last weekend (they've just gone onto broadband, finally!), when they e-mail me they get the following bounce back (as does another TalkTalk user). I can't decide if it's our server bouncing them or TalkTalk not liking us! I have recently added RBLs to our Exchange Server and have seen a reduction in Spam (we use Sophos Puremessage as well) so am reluctant to take them off.....
Reporting-MTA: dns; ttsmtp.cpwnetworks.com
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [212.xxx.235.xxx]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.7.1 Recipient not authorized, your IP has been found on a block list' (delivery attempts: 0)
This is your mail server not liking TalkTalk.
Hmm, well, ttsmtp.cpwnetworks.com isn't listed at Spamhaus at the moment, but it could have just been removed and DNS is still catching up. Your mail server logs should reveal which RBL it's being caught in. I've dealt with spamhaus before though, in a previous life, and they're a PITA
it was uceprotect.net, I found it by trawling through the logs. Learnt something new today (i.e. where the relevant logs are!) As well as running scripts in exchange powershell. Amazing how much has been blocked by the RBLs !! Just have to keep an eye for any other false positives, from research it looks like talktalk were blacklisted when their mail servers went down last week.......
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