Windows Live Mail not delivering emails with attachments

[zca]

I am using Windows Live Mail 2012 on a Windows 7 PC. I receive emails from my email hosting company that are designated as SPAM to the WLM Inbox. I will then sort through them and if I find a legitimate email, I will use WLM to forward that email to its intended recipient. I have noticed that any e-mails I receive that have attachments will not get delivered to the recipient. If I forward an email with an attachment, it will go to the WLM Sent Items folder but the recipient will never receive it. I get no error messages in WLM that the message could not be delivered. I see nothing in the Windows Event logs indicating a problem. WLM acts as though the email was sent OK, but the email never gets to the recipient. Emails that I forward from WLM without attachments always get to the recipient. New emails from WLM with attachments (or without) always get to the recipient. The problem only seems to occur when forwarding with attachments, and then sometimes it actually works when forwarding with attachments, but most of the time it does not. I'm thinking if might have something to do with the attachment itself, vs. the fact that there is an attachment.
I searched for an answer for this and have across a lot of people with similar issues, but not exactly the same one I am having. Just thought I would throw it out there and see if anyone had any ideas.

 

[zca]

Update:

Problem is occurring when forwarding email without attachments. In an effort to troubleshoot further, I installed Mozilla Thunderbird and configured it to use the same email account. The same emails that would not forward from Windows Live Mail will not forward from Thunderbird. Which means that I have the same problem and Windows Live Mail is not the issue. At this point I have to assume that there is something with the structure of these particular emails that is not allowing them to go through. I guess I will consider this issue closed, although I would love to hear from anyone that might have an idea about this.