cannot send from our exchange server to hotmail or windows live
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From: mw on 23 Apr 2010 18:45 Users on our exchange server 2007 cannot send email to hotmail or windows live accounts. We get the following message. SNT0-MC1-F42.Snt0.hotmail.com #550 SC-002 Mail rejected by Windows Live Hotmail for policy reasons. The mail server IP connecting to Windows Live Hotmail has exhibited namespace mining behavior. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support ##
From: John Oliver, Jr. [MVP] on 24 Apr 2010 13:26 Are you using a Static IP? Are you using a Smarthost? Please perform DNS report at www.dnsstuff.com to see if it passes all tests. This includes Reverse DNS Lookup Record, Spam Database Lookup, etc. -- John Oliver, Jr MCSE, MCT, CCNA Exchange MVP 2010 Microsoft Certified Partner "mw" <mw(a)discussions.microsoft.com> wrote in message news:14F12E7E-C1FE-4606-AFD1-91CC2ABB01A2(a)microsoft.com... > Users on our exchange server 2007 cannot send email to hotmail or windows > live accounts. We get the following message. > > SNT0-MC1-F42.Snt0.hotmail.com #550 SC-002 Mail rejected by Windows Live > Hotmail for policy reasons. The mail server IP connecting to Windows Live > Hotmail has exhibited namespace mining behavior. If you are not an > email/network admin please contact your E-mail/Internet Service Provider > for > help. Email/network admins, please visit http://postmaster.live.com for > delivery information and support ## >
From: Rich Matheisen [MVP] on 24 Apr 2010 14:09
On Fri, 23 Apr 2010 15:45:01 -0700, mw <mw(a)discussions.microsoft.com> wrote: >Users on our exchange server 2007 cannot send email to hotmail or windows >live accounts. We get the following message. > >SNT0-MC1-F42.Snt0.hotmail.com #550 SC-002 Mail rejected by Windows Live >Hotmail for policy reasons. The mail server IP connecting to Windows Live >Hotmail has exhibited namespace mining behavior. If you are not an >email/network admin please contact your E-mail/Internet Service Provider for >help. Email/network admins, please visit http://postmaster.live.com for email >delivery information and support ## I suppose that could mean that you've sent too many undeliverable messages to addresses at those domains. Or it might be that your server is being exploited to send junk e-mail to addresses that don't exist in those domains. Do you reject RCPT TO commands with addresses that don't exist in your domain (i.e. have you enabled recipient filtering)? --- Rich Matheisen MCSE+I, Exchange MVP |