Suspected Spam on emails

[b]Hello, I have been getting emails from a person for over 3 years and now all of a sudden in the subject line it has (SUSPECTED SPAM) whenever I get an email from her. I checked with my ISP and they said it was either my anti-virus program or my firewall. Is there a setting in Avast to stop this? I have tried to check every thing and can’t find where to change any settings. Thank you!

Cleo[/b]

Are you using avast 5 beta? Or stable version 4.8?
If 4.8, check another program as avast 4.8 does not have this feature.

What mail do you have?
hotmail / yahoo / gmail or are you using a mail program like outlook / outlook ekspress / windows mail / windows live mail