Deploy MIME Filter Agent
  • 18 Oct 2020
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Deploy MIME Filter Agent

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The SecureCircle MIME filter (sc-java-agent) is responsible for transparently replacing SecureCircle encrypted file attachments in MIME formatted messages with their decrypted version.

SMTP traffic will be internally re-routed through the MIME filter utilizing the system's firewall (iptables). By default, traffic going to port 12355 on the system's loopback adapter (127.0.0.1) will be redirected to the MIME filter on port 22355. The MIME filter will process the message, then send it to the upstream process listening on port 12355.

iptables setup is done in the file /apps/securecircle/bin/sc-java-agent.sh.

Action Command
Disable the service (will not start on boot) systemctl disable sc-java-agent
Enable the service (will start on boot) systemctl enable sc-java-agent
Monitor SMTP traffic using tcpdump. tcpdump -Ann -i lo tcp port 12355 or tcp port 22355 or tcp port 25
Restart the service systemctl restart sc-java-agent
Start the service systemctl start sc-java-agent
Stop the service systemctl stop sc-java-agent
Verify iptables rules have been loaded iptables -t nat -L OUTPUT
View service logs journalctl -au sc-java-agent
View service status systemctl status sc-java-agent
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