Email Blacklisting??

Got this today from one of our domains:

Reporting-MTA: dns; mailsmtp.info
X-Postfix-Queue-ID: 7B3A65E8E77
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Wed, 21 Nov 2007 12:16:16 -0500 (EST)

Final-Recipient: rfc822; [email protected]
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mx1c25.carrierzone.com[64.29.145.41] said: 550
5.7.1 [email protected]… H:MXB<64.187.103.203>Connection
refused due to abuse (in reply to RCPT TO command)

We have got your ticket. We’ll update you on ticket.

Thanks

Now it seems Hotmail is blocking Jodohost email IPs:

[email protected]: host mx2.hotmail.com[65.54.244.168] said: 550 SC-001
Mail rejected by Windows Live Hotmail for policy reasons. Reasons for
rejection may be related to content with spam-like characteristics or
IP/domain reputation problems. 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 (in reply to MAIL FROM command)

We have replied your ticket.