ola pessoal, tentei intalar o antvirus no meu servidor de email conforme a dica q postaram n seção semail/qmail/postfix.
esta acontecendo o seguinte erro:

Feb 14 12:12:40 srvmail amavisd[10808]: mail forwarding failed, retry: Failure to connect to local SMTP port: Bad file descriptor at /usr/sbin/amavis line 565. (message-id=<00a801c3f25d$0d58a760$0204a8c0@epnet.com.br>)
Feb 14 12:12:40 srvmail amavisd[10806]: do_exit:433 - ending execution with 75
Feb 14 12:12:43 srvmail postfix/pipe[10732]: 2CA5CEF663: to=<mkt@alban.com.br>, relay=vscan, delay=76061, status=deferred (temporary failure)
Feb 14 12:12:49 srvmail amavisd[10855]: Virus scanner failure: ScannerDaemon - UNKNOWN STATUS (error code: /var/amavis/amavis-09495542/parts: Can't access the file ERROR)