How do I obtain permission to fly in surface class E airspace under FAR-103?
By default, all controlled airspace (class E and up) is owned by an ARTCC. In many areas, they delegate airspace (including class E!) to other ATC facilities, either a TRACON or a Tower.
Unfortunately, that info isn't on Sectional or Terminal Charts; you have to look in the Chart Supplement (formerly Airport/Facility Directory). For KGFL, we see:

ARTCC: BOSTON CENTER
...
ALBANY APPROACH: 132.825
ALBANY DEPARTURE: 132.825

So, this area is owned by Boston ARTCC and delegated to Albany TRACON, and it helpfully gives you the latter's frequency to call if airborne.
You probably can't reach them by radio from the ground, so you would contact their Clearance Delivery (CD) by phone, which for this airport is found in the remarks:

FOR CD CTC ALBANY APCH AT 518-862-2299.

Just tell them in plain English why you're calling and what you want, and be ready to copy any instructions they give you. They might, for instance, ask you to wait because they have other traffic going in or out in the next few minutes, or they might ask you to contact them in the air so they can keep track of you (I assume they won't see you on radar) and warn other aircraft you're there. Or they might not care at all and just tell you to have a good flight.