Incorrect email address is used for Git commits when sending email notifications, this can be seen in the console log for a failed build:

Hudson Console:
---------------
(...)
Waiting for Hudson to finish collecting data
ERROR: Illegal whitespace in address
channel stopped
ERROR: Illegal whitespace in address
javax.mail.internet.AddressException: Illegal whitespace in address in string ``Geir Pettersen@comperio.no''

Notice how the author's full name is used before the @ instead of the account name.
By executing "git whatchanged" I can verify that the commit contains a correct email address in the author field:

$ git whatchanged
commit 53f56784f7299465e33f0cc483a397f23ea59fe5
Author: Geir Gullestad Pettersen <ggp@comperio.no>
Date: Mon Aug 9 02:03:35 2010 +0200

hudson test...

:100644 100644 5d2a1e7... fba468b... M src/main/java/no....