Managers have even stepped in to deliver letters and a national strike has been announced.
The agreement extends to firms that plan to deliver letters when the postal service is opened to competition on January 1st.
As a public service, it is obliged to deliver letters and packages to every corner of Germany, from islands in the Baltic Sea to the Bavarian Alps (its publicists peddle photographs of loyal employees punting down rivers to reach obscure addresses).
Separately, Mr Crozier has argued that the Royal Mail's universal service obligation - under which it is required to charge a single price to deliver letters anywhere in the UK - should be relaxed in order to help it compete in the deregulated market.
Her Majesty's post office already has a 30-year franchise to deliver the letters in Argentina.
Michael McNally, from Jersey Post, said Deutsche Post had been "amazing" in helping to deliver the letters and had gone to "enormous lengths" to make it possible.
The only way to free himself from Susan's spirit is to deliver her last letters.
Unlike those two companies, however, which both have thriving businesses doing what they already do, the USPS has drivers with fewer letters to deliver and a desperate need to innovate.
Last year, Forbes.com collected thousands of letters and set out to deliver them up to two decades in the future.
He targeted junk mail for destruction - opening some letters to see if they were important enough to deliver - because he couldn't deliver his rounds on time.
So far 10 of the 90 letters have been delivered and Jersey Post said it would continue to work with Deutsche Post to deliver as many more as possible.
BBC: WWII letters from German soldiers delivered 71 years late
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