Filters allow you to manage the flow of incoming emails. Using filters, you can automatically move, copy, redirect, discard, or reply your mail, even keep spam out-- all based on a combination of subject, sender, recipients, size and more.
To create a filter:
1. Login to webmail.
2. Goto Settings >> Filters
3. Click on "Add Filter".
4. Enter your filter criteria in the appropriate field(s).
5. Click on Save
Please note: The filters are only applicable for the new incoming emails. All the existing messages will remain unaffected by the filters.