site infected
http://research.zscaler.com/2011/04/uspsgov-website-infected-with-blackhole.html
avast reckons there is some sort of javascript infection on there and blocks the connection
The US Postal Service has pulled down a site hosting malicious code that was earlier used in a sophisticated multi-stage attack featuring the Blackhole Exploit kit. The infected site - http://ribbs.usps.gov - which is involved in the delivery of USPS's business mail-focused barcode-based Intelligent Mail services - was …