SMTP: Request Error Nested Request
This protocol anomaly triggers when it detects two or more SMTP commands without a reply in between. Normally, SMTP clients wait for a server reply before moving to their next command. This can indicate a denial-of-service or a tunneling attempt.
References
mx-19.3
vmx-19.3
vsrx-19.2
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vmx-19.4
mx-19.4
srxevo-25.4
vsrx-26.2
srx-26.2
srx-branch-26.2
vsrx3bsd-26.2
mx-12.3
srx-12.3
srx-branch-12.3
vsrx-12.3