This changes at least one of my Post drops. Good to find out now.
More info here: http://www.boston.com/news/local/new_hampshire/articles/2012/02/16/appalachian_trail_hikers_nh_post_office_to_close/
There's even the Appalachian Trail spin on it. I saw this posted on WhiteBlaze - always the place to go to hear the pulse and news of the Trail, it is a great resource.
The article does NOT state the exact date of closure, so it could theoretically be open when I go through there in August. This was only going to be a two day drop to get me to Lovette's Inn in Franconia - where Cara's parents own the B&B and it'll be like walking home!