getting input on error message of postmaster @mac.com

I am receiving emails from postmaster @mac.com with erorr messages. This is how it looks. How can I fix this

This report relates to a message you sent with the following header fields:

Message-id: <FABBD560-F81C-4758-AFB4-EF22BB15AE52@me.com>

Date: Tue, 16 Jul 2013 10:40:08 -0500

From: ROBERT SCOTT

To: Deborah Moncure

<2_TLZSFEZOP6I5HRU6N4RU5B6KNZ3C5ANCBS4TXVFSM22Q7DLC2C6MSMECYAVLZA5U33UUZK4S6TTL O@imip.me.com>

Subject: Event accepted: Marjorie Patton - Assessment Review

Your message cannot be delivered to the following recipients:

Recipient address: 2_TLZSFEZOP6I5HRU6N4RU5B6KNZ3C5ANCBS4TXVFSM22Q7DLC2C6MSMECYAVLZA5U33UUZK4S6TTLO @imip.me.com

Reason: Illegal host/domain name found

Original-envelope-id: 0MQ100J7ECUVGO10@st11p01mm-asmtp003.mac.com

Reporting-MTA: dns;st11p01mm-asmtp003.mac.com (tcp-daemon)

Arrival-date: Tue, 16 Jul 2013 15:40:08 +0000 (GMT)

Original-recipient:

rfc822;2_TLZSFEZOP6I5HRU6N4RU5B6KNZ3C5ANCBS4TXVFSM22Q7DLC2C6MSMECYAVLZA5U33UUZK4 S6TTLO@imip.me.com

Final-recipient:

rfc822;2_TLZSFEZOP6I5HRU6N4RU5B6KNZ3C5ANCBS4TXVFSM22Q7DLC2C6MSMECYAVLZA5U33UUZK4 S6TTLO@imip.me.com

Action: failed

Status: 5.4.4 (Illegal host/domain name found)

From: ROBERT SCOTT <rcharlesscott @me.com>

Subject: Event accepted: Marjorie Patton - Assessment Review

Date: July 16, 2013 10:40:08 AM CDT

To: Deborah Moncure <2_TLZSFEZOP6I5HRU6N4RU5B6KNZ3C5ANCBS4TXVFSM22Q7DLC2C6MSMECYAVLZA5U33UUZK4S6TTL O@imip.me.com>

Robert Scott has accepted your invitation to the event: Marjorie Patton - Assessment Review, scheduled for July 18, 2013 at 5:00 PM (Central Standard Time).

<Email Edited by Host>