SMTP: Too Many Boundaries
This protocol anomaly is an SMTP boundary depth that exceeds the user-defined maximum. The boundary depth indicates the number of nested attachments in a MIME multipart message. The default boundary depth is 4; you can change this setting in the Sensor Settings Rulebase>Protocol Thresholds and Configuration>SMTP>Maximum number of nested mime multipart attachments.
References
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3