DO YOUR RESEARCH GUYS
even theymos had the right instincts right at the start, shame too many people make assumptions rather then researching facts
It seems very likely that either Satoshi's email account in particular or gmx.com in general was compromised, and the email account is now under the control of someone else.
Perhaps satoshin@gmx.com expired and then someone else registered it.satoshi had sole access of the gmx account from 2009 to 2014. but due to inactivity he did not log in to agree to the new terms of service, thus upto march 2014 his account was intact and under his control.
the new terms of service for 2014 of GMX is that after 6 months of inactivity the dormant account can be deleted, where messaged will be archived. allowing for other people to then register the name. simply put. if the bitcoin creator never logged in, to then access the forum to say "i am not dorian". he would still be bound by the old terms of service which would mean that the account wont have been deleted. to then get easily activated 6 months later.
also even when the account has been deleted, the messages have been archived and GMX admits that if someone else reactivates the account they can get the old archived emails back.
now DO YOUR RESEARCH. i wont spoon feed you the proof as you will shout that i produced it. so go find it yourselves as its one google search away and researched by a reputable media outlet. i will give you 1 hint google 'Thomas Plünnecke satoshi'.. then go forth and from that, dig deeper and get second third and forth opinions from other sources.
happy hunting