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Published 16:31 5 Oct 2015 BST
Updated 16:34 5 Oct 2015 BST
According to Christian Falk, football correspondent for German newspaper Bild, Bayern Munich' chief executive officer is absolutely sick of being contacted by United over Muller's availability.
Heinz Rummenigge reportedly said: "I told Ed Woodward that I can't switch off my email account, so he should stop sending offers for Muller."
https://twitter.com/cfbayern/status/650774421817458688?ref_src=twsrc%5Etfw
However, this could just be a sign that their stance is weakening, Ed.
Rummenigge may have to change his email address.