How to Resolve - Apparently my email on outlook express has been blocked by everyone. Can this happen??

Apparently my email on outlook express has been blocked by everyone. Can this happen?

Message-id: <6CBE479ACA7F4B18B76D6C3E9519A2B3@yourb27fb1c401>
  Date: Sun, 08 Aug 2010 21:28:08 -0300
 
Your message cannot be delivered to the following recipients:

  Recipient address:  Reason: Server rejected MAIL FROM address.
  Diagnostic code: smtp;550 SC-004 Mail rejected by Windows Live Hotmail for policy reasons.
A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address.
If you are not an email/network admin
please contact
  Remote system: dns;mx4.hotmail.com
  Recipient address: XXXX
  Reason: Server rejected MAIL FROM address.
  Diagnostic code: smtp;550 SC-004 Mail rejected by Windows Live Hotmail for policy reasons.
A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address.
If you are not an email/network admin
please contact
  Remote system: dns;mx4.hotmail.com
Since the two people I was emailing are my husband and sister in law, I find it hard to believe they complained.
Is it possible someone is being malicious?  I am a 64 year old granny, and I highly doubt my mundane life would upset anyone.
Please help. 
thanks.
L

Keys to the Problem Apparently my email on outlook express has been blocked by everyone. Can this happen?

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