This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 72 hours on the queue on scanner01.mail.supportedns.com.
The message identifier is: 1c0ibI-0002Cz-4q
The subject of the message is: Re: http://www.xxx.com
The date of the message is: Sun, 30 Oct 2016 01:24:06 -0400
The address to which the message has not yet been delivered is:
No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
Reporting-MTA: dns; scanner01.mail.supportedns.com
After I sent an email, I got a delivery error message back above, and I don't know what it means. Normally, I would look up the error code, but I don't see one here. I was wondering if his is a "receiving" error on their end, or a "sending" error on my end. If it's on their end, then I don't really care. But if it's on my end, then I do. Admittedly, the email address I was sending it to was an old business contact, which I wouldn't be surprised if it was dead email by now.