Blocking Hahaha at server level

Whats the best way of blocking Hahaha virus at server level. ? Help   David         ---Outgoing mail is certified Virus Free.Checked by AVG anti-virus system (http://www.grisoft.com).Version: 6.0.219 / Virus Database: 103 - Release Date: 05/12/2000

Message size limiting

Hello   I would like to set a max size for mail sent to a specific Maildir and alert the recipient or the sender that such a mail has been rejected. Any ideas,   thanx   Davidson   ---Outgoing mail is certified Virus Free.Checked by AVG anti-virus system (http://www.grisoft.com).Version: 6.0.