Curious address

[Geoffrey Leach <geoff hughes net>]

Here's the beginning of an email address that was given by a site:

customercare259 ikea 
com?subject=General%20Question&body=In%20order%20for%20us%20to%20better%20serve%20you%20please%20include%20the%20following%20information

The mail was rejected: error 501 - recpt syntax error.  Perhaps not surprising.

So - who's at fault? The website for generating the address with the trailing junk, or Balsa for not 
translating the junk into something presentable? Or me for not editing the address - to what?