on the download center page for Universal Email, in the known issues section, there is a known issue for errors when using Pear mail.
it's hard to troubleshoot the errors because you describe them without giving the actual error.
please include the actual error text rather then describing then, it is much more helpful.
you say that the attachment is not being received, but the errors suggest that the entire email is not being received, is it the problem with the email being received without attachments or it i the email is not being received at all?