problems sending e mail from @me.com account

I am unable to send e mails to some organizations from my @me.com e mail account. Please see the error below. What does it mean and how can I fix it.

I have no problems sending e mails to these organizations from alternative e mail addresses.

Thanks Antony


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

Message-id: <[email protected]>
Date: Thu, 07 Jul 2011 11:06:43 +0200
From: Antony Berrill <[email protected]>
To: Coleen Dannhauser <[email protected]>
Subject: keys to green belt

Your message cannot be delivered to the following recipients:

Recipient address: [email protected]
Reason: Server rejected MAIL FROM address.
Diagnostic code: smtp;554 5.1.0 Sender denied
Remote system: dns;coct-edge-003.capetown.gov.za (TCP|17.148.16.100|58477|41.208.10.119|25)

Reporting-MTA: dns;asmtp025-bge351000.mac.com (tcp-daemon)
Arrival-date: Thu, 07 Jul 2011 02:06:38 -0700 (PDT)

Original-recipient: rfc822;[email protected]
Final-recipient: rfc822;[email protected]
Action: failed
Status: 5.0.0 (Server rejected MAIL FROM address.)
Remote-MTA: dns;coct-edge-003.capetown.gov.za
(TCP|17.148.16.100|58477|41.208.10.119|25)
Diagnostic-code: smtp;554 5.1.0 Sender denied

The issue is typically their ISP problem. Their server is rejecting the email address. Went through this with 2 companies we work with a couple of years ago that was rejecting our domain name - both of them had the same ISP and took a couple of months to resolve the issue.

Never did find out how it was resolved, but the fix was done by the ISP. As it happened in our case, we also used the same ISP. Did the same as you're probably doing and reverted to using my personal email (only when it had to be email in lieu of some other method such as fax) instead of the company email during that time.

Thanks