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Block outgoing email because of VPN server

We have Cisco VPN on ASA for over 4 years. Recently, blocks our outgoing email because of these reasons: •Your email server contains a virus and has been sending out spam. •Your email server may be misconfigured. •Your PC may be infected with a virus or botnet software program. •Someone in your organization may have a PC infected with a virus or botnet program. •You may be utilizing a dynamic IP address which was previously utilized by a known spammer. •Your marketing department may be sending out bulk emails that do not comply with the CAN-SPAM Act. •You may have an insecure wireless network which is allowing unknown users to use your network to send spam. •In some rare cases, your recipient's Barracuda Spam Firewall may be misconfigured. This is the undeliverable message: rejected your message to the following e-mail addresses and  gave this error: Service unavailable; Client host [VPN IP] blocked using Barracuda Reputation; IP Address The IP address they blocks is our VPN server. Why?                   

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