SMTP logins , Verification mail not sent to @yahoo , @domain

I set up the script successfully , but it seems many things not work. The script only sent confimarmation email to @hotmail account , but not to @yahoo /or @anydomain.The forgotten password is not sent to any email for 4 5 hours now. As Far as I can see It only uploads successfully .flv files, or mp4 files (but no sound). None of the .avi , .mpeg , work , i upload files less than 10 mb but still not working. My server settings are correct. Please help!I