(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:
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.