I sent an email to my sis [whom I email on a regular basis] and 3 days later it came back undelivered with the following message:
Temporary error returned by SMTP partner.
smtp;421 RP-001 The mail server IP connecting to Windows Live Hotmail server has exceeded the rate limit allowed.
Reason for rate limitation is related to IP/domain reputation problems.
Does this mean I might have a virus that's using my email client to spam other people? What does it mean?