many e-mails with viruses comes to my account . how can i detect and delete these virus.

Antivirus also referred to as ClamAV can solve your problem.
Antivirus checks incoming mail for viruses and if detects any, sends e-mail notification about it and deletes the virus mail. Antivirus resource can be enabled for all mail domains in your account, for specific maildoman and for mail resources of specific maildomain.

how can we manage antivirus protection on our account

To manage antivirus for the entire account:

1. Select Account settings in the Account menu.
2. Click to add antivirus resource for all mailboxes or for all mail resources (box, forward, alias, responder) in this account.
3. You can delete all antiviruses in this account by clicking the Trash icon.

can we manage antivirus protection on the mail domain level and mail resource level ?? and how can we do it

yes, u can do it

To manage antivirus at the level of mail domains:

1. Go to the Mail Info menu and select a mail domain from the drop-down box.
2. Click Go and you will see the mail service details of the chosen mail domain:
3. On the page you will be taken to, add antivirus resource either for all mailboxes of this mail domain or for all mail resouce (box,forward,alias,responder).
   If necessary, you can delete all antiviruses under this maildomain by clicking the Trash icon.
4. Clicking the antivirus icon will let you configure antivirus settings for mail resources.
5. Click the Submit button at the bottom of the form.

To configure antivirus protection for a mail resource:

1. Click the e-mail address in the E-mail list on the Mail Manager page.
2. Check the AntiVirus box.
3. Click the Submit button at the bottom of the form.
4. On the Mail Manager page click the Antispam icon in the Resources included column:
5. On the page that appears, edit the Antivirus Preferences if necessary
6. Click Submit.