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Am I able to configure zimbra.. in this case amavis & clamAV, to scan outgoing email message?
Previously, during my experience with qmail+cyrus+squirrelmail, I used an external machine running Mailscanner as my spam/virus scanner. As for outgoing emails.. the attachment will be scanned and the email will have some tag that declares the email has been virus-scanned before being send.
Bugzilla
Wiki
Source
Virus scan for outgoing email 
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