[Mimedefang] Problem regarding Antivirus

[Nauman Habib]

i get this error - trying to send e-mails thorough my mail server . i have
tried to stop clamd and Mimedefang . but it just works for 3-4 min and then
this error comes again

Any Idea how to solve -


An unknown error has occurred. Subject 'Re: aaq', Account:
'mail.worldcall.net.pk', Server: 'mail.worldcall.net.pk', Protocol: SMTP,
Server Response: '451 4.3.0 Problem running virus-scanner', Port: 25,
Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC6A