Simon, I will forward your email internally. Neil.
From: Simon Green <[email protected]<mailto:[email protected]>> Date: Monday, 2 December 2013 15:11 To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [uknof] BT/Yahoo Mail Cry for Help! HI List, I appreciate this is not the normal subject matter, but I'm really struggling so reaching for help here! We've got a problem that BT have suddenly started blocking any email from any of our netblocks, with an error saying there is no valid PTR record on the IP. Here's an example: SMTP error from remote mail server after initial connection: host mx.bt.lon5.cpcloud.co.uk [65.20.0.49]: 421 smtpin41.bt.ext.cpcloud.co.uk Service not available - no PTR record for 134.0.22.242: retry timeout exceeded However, we DO have PTR records set: $ dig +short -x 134.0.22.242 shared4.wirehive.net. We suspect a bug on the BT side. We've tried to get in touch through the direct BT support avenues, but they have no idea what we're talking about and don't even know where to direct us. If there is someone on this list who can help with a contact I'd really appreciate it. Alternatively if anyone can see something invalid/wrong with our RIPE domain delegation, PTR responses, or anything DNS related we're doing wrong I'll send you a case of beer! Perhaps BT have recently changed something that they check against and it's a badly trapped error?! Simon
