holy smoly unnecessary words and awkward phrases.

Good morning, Replace with a more generic greeting. what if they're reading it in the afternoon or the evening?

I was very interested to learn of the Purchasing Coordinator role that you have available in your (city) location. really awkward phrasing, "I was very interested to learn of", need to reword; replace "role" with position, replace "that you have available in your (city) location" with just "at (city)".

(company) has always been an exciting company for me, as I greatly admire both its growth in a difficult industry as well as its firm commitment to sustainability. restructure as "I greatly admire (company) for ~blahblahblah reason~.

The chance to work for a company who makes a truly stellar product with a minimal carbon footprint is one I’m absolutely delighted to pursue. again weird structuring. how about "I'm absolutely delighted to purse the chance to... ~blahblahblah~.

In addition to my own interest in the position, I’m encouraged by the near perfect match between the available position and my own experience. just, "I believe I am a perfect match for this position."

I’ve spent several years in purchasing, dealing with purchasing, warehouse management, as well as working with production schedules and floor managers at two leading Integrated Services companies in the Aviation industry. is there a more professional term for dealing with purchasing? also, problem with parallelism after "as well as" makes the sentence confusing to read. reword

I’m familiar with the leading packaging vendors and have dealt with both local and national vendors across multiple industries. good

I’ve bought and managed inventory for a wide range of customer needs, and I’m well-acquainted with the sometimes frantic emergencies that arise in a purchasing environment; dash between "well" and "acquainted," "sometimes frantic" detracts from an otherwise strong sentence.

working long days and weekends in order to minimize both standing inventory and disruptions on the factory line. this is a fragment. you can't use that with a semicolon. I'm guessing you meant to put in a comma instead.

I’m also very familiar with all Microsoft products, especially Excel, where AT WHICH I am exceptionally proficient.

I also have plenty of experience dealing with the A/P side of accounting, both in reconciling invoices and cutting purchase orders. something stronger than "plenty of" would be good.

~~Lastly, I feel that culture is an extremely important element of success for employee and company both. As a Purchasing Coordinator, one deals with others in the company as often as they deal with Vendors. I believe that X came to (city) because they viewed the area as a great fit culturally for the company. ~~ not really necessary?

Likewise I believe (company) and I will make an equally great fit. replace the last paragraph with a generic thank you & please contact at this number and such and such address. it's good to include your available times.

The formal ending to all letters go:

salutation, handwritten signature (optional, but it looks professional) full name