Using Outlook 2013 connected to Microsoft's hosted exchange service, I sent a total of about 10 emails yesterday and today (combined), each to less than 4 recipients. One of the emails I sent last night resulted in the return message below.
Unlike with all of the other items in my inbox, when I open this one, the Tags group on the ribbon bar does not have the "Message Options" icon in the bottom-right corner which ordinarily could click to bring up the message's properties and see the message's headers. This leads me to believe that the message was sent to my by Microsoft's Exchange Server.
Certainly, if a server cannot deliver a message, it knows of some reason why not (inability to connect to some other server, rejection by other server, invalid contents, whatever). Yet the error message fails to disclose any reason. (Does Microsoft not have better guidelines for designing such communications?)
Anyway, given the few emails and few recipients I have sent to, I suspect the email/recipient quantity limitations spoken of in other forum posts are not the reason in this case.
Any ideas as to what would cause this? [For privacy I have changed the email addresses in the message below.]
Your message did not reach some or all of the intended recipients.
Subject: Home page form
Sent: 8/8/2013 2:44 AM
The following recipient(s) cannot be reached:
Sean Smith (ssmith@notreallygmail123.com) on 8/8/2013 2:44 AM
This message could not be sent. Try sending the message again later, or contact your network administrator. Error is [0x80004005-00000000-00000000].
Taylor Smith (taysmith@notreallygmail123.com) on 8/8/2013 2:44 AM
This message could not be sent. Try sending the message again later, or contact your network administrator. Error is [0x80004005-00000000-00000000].