Resolved: smtp.psu.edu issues
smtp.psu.edu started experience problems with one of its backend servers starting on Nov 8, 2012 10:30 PM. Users may have seen error messages when attempting to send e-mail. The server was worked on as of 5:30 morning, but it was determined later, the wrong smtp.psu.edu backend server was worked on. So, the correct one was not fixed until 8:00 AM on Nov 9, 2012.
More information: Resolved: smtp.psu.edu issues
Story added 9. November 2012, content source with full text you can find at link above.