We had a similar issue in May I can't say for sure why, but we discovered that the IP's of our two outgoing mail servers were listed on Backscatter.org http://www.backscatterer.org/index.php?target=test The give the option of fronting up $$ to be removed immediately or waiting for auto-delist in a month. Suffice to say we took the latter option and set an smtp fallback Cheers JT -- Jodi Thomson Network & Systems Engineer Ph +64-6-8355800 Fax +64-6-8355811 Mob +64-21-903712 E-Mail jodi(a)team.waspnet.co.nz www.waspnet.co.nzhttp://www.waspnet.co.nz/ From: nznog-bounces(a)list.waikato.ac.nz [mailto:nznog-bounces(a)list.waikato.ac.nz] On Behalf Of Steve Brorens Sent: Thursday, 7 June 2012 2:14 p.m. To: 'NZNOG Mailing List' Subject: [nznog] Hotmail.com live.com blocking NZ For all of this month we're seeing a wide IP ranges - from several local ISPs - being blocked by the hotmail.com and live.com mail servers. We understand that the ISPs concerned are working directly with Microsoft - anyone on this list able to give some feedback on progress? - steve ------------------------------ Steve Brorens Systems Architect CommArc Consulting Ltd Mail: sjb(a)commarc.co.nzmailto:sjb(a)commarc.co.nz Phone: 021 332289 ------------------------------ ________________________________ This e-mail has been scanned for Viruses and Content and cleared by Mail Marshal