Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

xxkozxx's avatar
xxkozxx
Icon for Nimbostratus rankNimbostratus
Jun 15, 2020

SMTP Proxy Not receiving Client Quit...

I recently ran into a situation where legacy devices are sending emails for alerting. However, the firmware uses AUTH PLAIN as the security mechanism which is no longer supported in the new 0365 code...
application delivery
big-ip
irules
smtp proxy
Lovell_Scott's avatar
Lovell_Scott
Icon for Nimbostratus rankNimbostratus
Jul 31, 2023

xxkozxx,

If you add a TCP::release statement in your SERVER_DATA (QUEUED) section it shoud resolve your issue.

    #SEND QUEUED 250 RESPONSE BACK TO CLIENT
    if { $sdata contains "Queued" } {
        log local0. "GenMail: Server Queued Response <$sdata>"
        TCP::release
        return
    }