There's no universal reason for messages to be sent automatically to a junk folder that's valid by default across all possible email clients. The receiver has to set up message rules for that. So all you've got to do to answer that question: check the receivers rules.
On that other computer: make a new Windows XP/Vista account and setup Outlook there. Then disable any outgoing antivirus check you've got (you know, that programs spamming themselves in your mail by adding something like 'This mail was checked virusfree by X' at the bottom) and try again.
My first problem is that when I send emails from my Microsoft Office Outlook, they end up becoming Spam on the recipient's inbox or probably just end up in their junk folder. Why does this happen and how can I rectify this?
My second problem is with my other Computer. Whenever I try to send mails from my Microsoft Office Outlook, they just dont go. They end up being stuck in the Outbox for hours.. infact.. forever.. They never go. So ultimately, I have to use my other computer. (So I have this problem only in 1 computer). This problem wasn't there earlier.. It happened a few weeks back. How can I repair this problem?