Undeliverable mail: Read:_Windows Xp for 50 bucks

[MAILER-DAEMON at mailfe05.swip.net]

Failed to deliver to 'leif.pettersson at mailbox.swipnet.se'
SMTP module(domain old.swip.net) reports:
 host old.swip.net says:
 550 Invalid recipient: <leif.pettersson at mailbox.swipnet.se>

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