I found out that when I use my work e-mail's webmail on my computer to send a .DOC attachment, the recipient would not be ABLE to open that *.doc file. There'll be an error message COMING up on Microsoft Word saying: THE DOCUMENT NAME OR PATH IS NOT VALID.

This only happens on my computer - when I use other computers I can send .DOC attachment using the same webmail INTERFACE with no problem.

On my computer, I am able to use my work e-mail's webmail to send attachment in any format (JPG, PDF, XLS, etc...). This problem only happens on .DOC file. I can even send an .RTF file (created from the very same .DOC file on my computer that became UNOPENABLE after sending through webmail) and the recipient can open it with no problem.

I tried using my work e-mail to send .DOC attachment to my other e-mail accounts, and when I open it from my computer there's still the error message coming up on Microsoft Word.

When I tried using my other e-mail accounts (e.g. Gmail, Yahoo, Hotmail etc.) to send .DOC attachments there is no problem at all too. I am also able to send .DOC attachment on my work e-mail using POP3 on Thunderbird.

So this problem only occurs when I use my computer to send .DOC attachment using my work e-mail account's webmail.

This is very weird, I already asked my webmaster but they have no idea how to fix this.

Is there anyone who heard of something similar who would be able to help? THANKS very much in advance.This isn't a direct solution but may be an indirect solution. Since you have the POP3 option, why not use POP3 instead of webmail?Where is the .doc file located ? ?
It has to be on the machine you are sending it as an attachment in order for this to work without a pickaxe and shovel...Yeah, maybe I'd better switch to POP3 too... But still think it's very weird there is this problem happening.

The .doc files are on my hard drive. As said, I can send them fine on any other webmail accounts and on POP3, there only seems to be a problem when I use this one particular account's webmail. And this also only happens on .doc files - not any other file type (even .rtf or .docx work fine too).