Mac Mail causing 554 NDR's from mxlogic.net?

(FYI although the company is the same, this thread describes a different scenario than the other "NDR related posts" I've made recently.)

A small non-profit uses godaddy for email. The are getting 544 return codes in NDRs for the emails they send to a few of their sister companies -- but it happens ONLY if they send with the Mac Mail email client. If they use Godaddy webmail, it goes through OK.

I gave godaddy this info, along with the full headers & return codes. The tech said that the tech group that he sent the info off to (at go daddy) said thait this portion of the code:
   "p02c11m103.mxlogic.net"
indicates "McAfee Security", that mxlogic.net is associated with McAfee, and that McAfee might be part of the Mac Mail client.  Therefore I should call mxlogic.

We had one of those conversations like Randy Marsh talking to Chef (when the voice actor for chef was gone), where I said, "Do you mean a, b and c?  Or more like x, y and z?" And he kept saying, "Yup".

What he agreed to was that Mac Mail might contain some McAfee software that's changing the emails and causing them to be flagged by McAfee servers (!), OR that mxlogic.net is reacting to something the Mac Mail is putting into the emails. (Sounds better.)

I'm so burned out. Any help would be greatly appreciated.

I've attached a file containing bunch of the headers / return codes. I hope it's clear where one ends and the other begins.
dgrrrAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
A search verifies that mxlogic.net is email security for McAfee and a lot of people have had the problem that you are seeing.

https://www.google.com/search?q=mxlogic.net
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Dave BaldwinFixer of ProblemsCommented:
Nothing attached.  McAfee shouldn't be there unless McAfee for Mac is installed.  Or was installed.  http://www.mcafee.com/us/products/virusscan-for-mac.aspx
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Dave BaldwinFixer of ProblemsCommented:
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dgrrrAuthor Commented:
Thank you so much!  I did find 2 of the 3 of those myself, but I didn't see any mention anything about the email client being involved, so I didn't know if it would help.  I'll read them.  

How relevant do you think the "Mac Mail only" portion of this issue is?

I'll try attaching again now:
Untitled.rtf
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Dave BaldwinFixer of ProblemsCommented:
It's only relevant because it is the desktop mail client on a computer that at least had McAfee on it.  McAfee won't be found on Godaddy web mail.  They have their own virus and malware scanners.
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dgrrrAuthor Commented:
I might have been unclear - What computer has McAfee on it?  

Issue may have been resolved - a new call from me to godaddy resulted in me getting a phone number at McAfee / SaaS / MXLogic.net, then an email for reporting false positives. Which I did. So far no bounces. Fingers crossed.

Re: why it happens in Mac Mail but not Webmail -- the former requires user to specify servers and ports to be used, whereas Webmail does not. Could that explain it?
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dgrrrAuthor Commented:
PS to Dave Baldwin - I re-went through the page you gave me
 http://www.experts-exchange.com/Software/Anti-Virus/Q_28107861.html

And saw that the solution was there. I was too burned out to see it. Thanks!
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