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    Collect Proofpoint Sendmail Sentrion logs

    Supported in:

    This document explains how to ingest Proofpoint Sendmail Sentrion logs to Google Security Operations using the Bindplane agent.

    Proofpoint Sendmail Sentrion is an enterprise mail transfer agent (MTA) that provides security controls, message tracking, and policy enforcement for outbound and inbound email. It logs mail transactions through the standard syslog mail facility.

    Before you begin

    Make sure you have the following prerequisites:

    • A Google SecOps instance
    • Windows Server 2016 or later, or Linux host with systemd
    • Network connectivity between the Bindplane agent and the Proofpoint Sendmail Sentrion MTA server
    • If running behind a proxy, ensure firewall ports are open per the Bindplane agent requirements
    • Privileged access to the Proofpoint Sendmail Sentrion server with root or administrator permissions

    Get Google SecOps ingestion authentication file

    1. Sign in to the Google SecOps console.
    2. Go to SIEM Settings > Collection Agents.
    3. Download the Ingestion Authentication File.

    4. Save the file securely on the system where Bindplane will be installed.

    Get Google SecOps customer ID

    1. Sign in to the Google SecOps console.
    2. Go to SIEM Settings > Profile.

    3. Copy and save the Customer IDfrom the Organization Detailssection.

    Install the Bindplane agent

    Install the Bindplane agent on your Windows or Linux operating system according to the following instructions.

    Windows installation

    1. Open Command Promptor PowerShellas an administrator.

    2. Run the following command:

        msiexec 
  
 / 
 i 
  
 "https://github.com/observIQ/bindplane-agent/releases/latest/download/observiq-otel-collector.msi" 
  
 / 
 quiet

    3. Wait for the installation to complete.

    4. Verify the installation by running:

       sc query observiq-otel-collector

      The service should show as RUNNING.

    Linux installation

    1. Open a terminal with root or sudo privileges.

    2. Run the following command:

       sudo  
sh  
-c  
 " 
 $( 
curl  
-fsSlL  
https://github.com/observiq/bindplane-agent/releases/latest/download/install_unix.sh ) 
 " 
  
install_unix.sh

    3. Wait for the installation to complete.

    4. Verify the installation by running:

       sudo  
systemctl  
status  
observiq-otel-collector

      The service should show as active (running).

    Additional installation resources

    For additional installation options and troubleshooting, see the Bindplane agent installation guide .

    Configure the Bindplane agent to ingest syslog and send to Google SecOps

    Locate the configuration file

    • Linux:

       sudo  
nano  
/opt/observiq-otel-collector/config.yaml

    • Windows:

       notepad "C:\Program Files\observIQ OpenTelemetry Collector\config.yaml"

    Edit the configuration file

    • Replace the entire contents of config.yaml with the following configuration:

        receivers 
 : 
  
 udplog 
 : 
  
 listen_address 
 : 
  
 "0.0.0.0:514" 
 exporters 
 : 
  
 chronicle/proofpoint_sentrion 
 : 
  
 compression 
 : 
  
 gzip 
  
 creds_file_path 
 : 
  
 '<CREDS_FILE_PATH>' 
  
 customer_id 
 : 
  
 '<CUSTOMER_ID>' 
  
 endpoint 
 : 
  
< REGION_ENDPOINT 
>  
 log_type 
 : 
  
 PROOFPOINT_SENDMAIL_SENTRION 
  
 raw_log_field 
 : 
  
 body 
  
 ingestion_labels 
 : 
  
 env 
 : 
  
 production 
 service 
 : 
  
 pipelines 
 : 
  
 logs/sentrion_to_chronicle 
 : 
  
 receivers 
 : 
  
 - 
  
 udplog 
  
 exporters 
 : 
  
 - 
  
 chronicle/proofpoint_sentrion

    Configuration parameters

    • Replace the following placeholders:

    • Receiver configuration:

      • udplog : Receives syslog over UDP. Use tcplog if you configured TCP transport in the syslog configuration.
      • 0.0.0.0:514 : Listens on all interfaces on port 514. Change the port if needed (for example, 1514 for non-root Linux).

    • Exporter configuration:

      • <CREDS_FILE_PATH> : Full path to ingestion authentication file:
        • Linux: /etc/bindplane-agent/ingestion-auth.json
        • Windows: C:\Program Files\observIQ OpenTelemetry Collector\ingestion-auth.json
      • <CUSTOMER_ID> : Customer ID from the Get Google SecOps customer IDstep.
      • <REGION_ENDPOINT> : Regional endpoint URL:
        • US: malachiteingestion-pa.googleapis.com
        • Europe: europe-malachiteingestion-pa.googleapis.com
        • Asia: asia-southeast1-malachiteingestion-pa.googleapis.com
        • See Regional Endpoints for complete list.

    Save the configuration file

    • After editing, save the file:
      • Linux: Press Ctrl+O , then Enter , then Ctrl+X
      • Windows: Click File > Save

    Restart the Bindplane agent to apply the changes

    • To restart the Bindplane agent in Linux, run the following command:

       sudo  
systemctl  
restart  
observiq-otel-collector

      1. Verify the service is running:

         sudo  
systemctl  
status  
observiq-otel-collector

      2. Check logs for errors:

         sudo  
journalctl  
-u  
observiq-otel-collector  
-f

    • To restart the Bindplane agent in Windows, choose one of the following options:

      • Command Prompt or PowerShell as administrator:

         net stop observiq-otel-collector && net start observiq-otel-collector

      • Services console:

        1. Press Win+R , type services.msc , and press Enter.
        2. Locate observIQ OpenTelemetry Collector.
        3. Right-click and select Restart.

        4. Verify the service is running:

           sc query observiq-otel-collector

        5. Check logs for errors:

            type 
  
 "C:\Program Files\observIQ OpenTelemetry Collector\log\collector.log"

    Configure Proofpoint Sendmail Sentrion syslog forwarding

    Sendmail Sentrion uses the standard syslog mail facility to write mail transaction logs. The default log locations depend on the operating system:

    OS Default log path
    RHEL / CentOS /var/log/maillog
    Debian / Ubuntu /var/log/mail.log
    Solaris /var/log/syslog (filtered by mail.* )

    Option 1: Configure syslog forwarding using rsyslog

    1. Edit the syslog configuration file on the Sentrion MTA server:

       sudo  
nano  
/etc/rsyslog.d/sentrion.conf

    2. Add the following rule to forward mail facility logs to the Bindplane agent:

       mail.*    @BINDPLANE_AGENT_IP:514

    3. Save the file and restart the rsyslog service:

       sudo  
systemctl  
restart  
rsyslog

    4. Verify that logs are being forwarded by checking the Bindplane agent logs.

    Option 2: Configure syslog forwarding via the Sentrion management console

    1. Sign in to the Sentrion management console.
    2. Navigate to Configuration > Logging(or System > Log Settings).
    3. Configure remote syslog settings:
      • Syslog server: Enter the IP address of the Bindplane agent host (for example, 192.168.1.100 ).
      • Port: Enter 514 (must match the Bindplane agent receiver port).
      • Protocol: Select UDP(must match the Bindplane agent receiver configuration).
      • Log level: Set to capture all mail transaction events.
    4. Click Applyor Save.
    5. Verify that logs are being forwarded by checking the Bindplane agent logs.

    UDM mapping table

    Log Field UDM Mapping Logic
    		additional.fields Merged from tty_label and pwd_label
    action
    		 security_result.action_details Value copied directly
    action_result
    		 security_result.summary Value copied directly if present
    app
    		 principal.application Value copied directly
    app_proto
    		 network.application_protocol Value copied directly
    auth
    		 security_result.detection_fields Merged as auth_label (key: auth, value: auth)
    bits
    		 security_result.detection_fields Merged as bits_label (key: bits, value: bits)
    categorization
    		 security_result.category_details Value copied directly
    cipher
    		 network.tls.cipher Value copied directly
    class
    		 security_result.detection_fields Merged as class_label (key: class, value: class)
    cluster
    		 principal.resource.attribute.labels Merged as cluster_label (key: cluster, value: cluster)
    COMMAND
    		 principal.process.command_line Value copied directly
    daemon
    		 security_result.detection_fields Merged as daemon_label (key: daemon, value: daemon)
    delay
    		 security_result.detection_fields Merged as delay_label (key: delay, value: delay)
    description
    		 security_result.description Value copied directly
    details
    		 metadata.description Value copied directly
    disposition
    		 security_result.detection_fields Merged as disposition_label (key: disposition, value: disposition)
    dsn
    		 security_result.detection_fields Merged as dsn_label (key: dsn, value: dsn)
    event_type
    		 metadata.event_type Value copied directly
    from
    		 network.email.from Extracted as valid_from using grok pattern if valid email
    host
    		 principal.asset.hostname, principal.hostname Value copied directly
    ip
    		 principal.asset.ip, principal.ip Value copied directly
    job_name
    		 principal.resource.attribute.labels Merged as job_name_label (key: job_name, value: job_name)
    mailer
    		 security_result.detection_fields Merged as mailer_label (key: mailer, value: mailer)
    msgid
    		 network.email.mail_id Value copied directly after removing < and >
    mtaqid
    		 principal.resource.product_object_id Value copied directly
    nw_direction
    		 network.direction Set to OUTBOUND if matches (?i)Outbound
    nrcpts
    		 security_result.detection_fields Merged as nrcpts_label (key: nrcpts, value: nrcpts)
    pid
    		 principal.process.pid Value copied directly
    port
    		 principal.port Value copied directly and converted to integer
    pri
    		 security_result.detection_fields Merged as pri_label (key: priority, value: pri)
    processor
    		 principal.resource.attribute.labels Merged as processor_label (key: processor, value: processor)
    product_event_type
    		 metadata.product_event_type Value copied directly
    reject_msg
    		 security_result.summary Value copied directly if action_result, stat, and status empty
    relay_domain
    		 intermediary.hostname Value copied directly
    relay_ip
    		 intermediary.ip Value copied directly
    ruleset
    		 security_result.rule_name Value copied directly
    severity
    		 security_result.severity Set to INFORMATIONAL if matches (?i)info
    size
    		 network.sent_bytes Value copied directly and converted to uinteger
    STARTTLS
    		 security_result.detection_fields Merged as starttls_label (key: STARTTLS, value: STARTTLS)
    stat
    		 security_result.summary Value copied directly if action_result empty
    status
    		 security_result.summary Value copied directly if action_result, stat, and reject_msg empty
    subject
    		 network.email.subject, security_result.detection_fields Value copied directly and merged as subject_label (key: subject, value: subject)
    tls_verify, verify
    		 security_result.action, security_result.description Set to ALLOW if matches (?i)OK, BLOCK if matches (?i)FAIL; description set to tls_verify - tls_verify; tls_verify from verify if tls_verify empty
    to
    		 network.email.to Extracted as valid_to from array using grok pattern for each email
    USER, user
    		 principal.user.userid Value from USER if not empty, else from user
    version
    		 network.tls.version Value copied directly
    xdelay
    		 security_result.detection_fields Merged as xdelay_label (key: xdelay, value: xdelay)
    		metadata.product_name Set to "Proofpoint Sendmail Sentrion"
    		metadata.vendor_name Set to "PROOFPOINT_SENDMAIL_SENTRION"

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