Hint: For larger downloads, a Metalink client is best -- easier, more reliable, self healing downloads.
The metalink for this file is: http://download.opensuse.org/repositories/mozilla/SLES_9/x86_64/MozillaSunbird-0.9-6.2.x86_64.rpm.metalink
List of best mirrors for IP address 38.107.191.116, located in country US, 38.0.0.0/8 (AS174).