How Can I track emails coming in to Sonicwall Email Security?
Tracking emails.
You can trace a particular email and find out if it ever hit the sonicwall device and or it was rejected, deleted, Junked or bounced. Any email that hits the Email security device irrespective of being rejected, deleted, bounced, junked, gets recorded in a log file called “Mfe”
Please follow the following steps to get to the log:

Message Location category:
ju= Junk box
rj = rejected
dv = delivered
qu = queued
bo = bounced
Message Threat Category:
ddha = Definate directory harvest attack
dspm= Definate Spam
lspm = Likely Spam
dvir = Definate Virus
lvir = Likely Virus
dphi= Definate Phishing
lphi = Likely Phishing
good = good email (no Threat)
Plyt = Policy Threat
Example of 1 email’s Mfe log entry:
5 px i ju dspm 192.168.6.110_ ---- -------------- --------------- ----- ---- -------p---- ------------ 202211160004590086296 testmail@sonicwall.com - testaccount@test.com testaccount@test.com "John Smith" Your credit balance is over its limit 3289 emailsecurity 192.168.1.10 25 collab - - rules:rules:Score=-31.26 518d52eee664842c en_US <000d01ca6655$931ac960$6400a8c0@withoj2> 192.168.6.110
Conclusion:
Version= 5
Inbound/outboud = i
Msg/Location= ju
MsgThreat= dspm
GotfromIP = 192.168.6.110
MlfUniqueId = 202211160004590086296
EnvRcptTo = testmail@sonicwall.com
EnvMailFrom = testaccount@test.com
HdrFromAddr = testaccount@test.com
HdrSubject = your credit balance is over its limit
MsgSizeInBytes= 3289
NqMlfHost = emailsecurity
NextHopServer = 192.168.1.10
NextHopPort = 25
Categories = collab
Reason = rules:rules:Score=-31.26
SecuritySecret = 518d52eee664842c
MsgLanguage = en_US (English- US)
Message-ID = <000d01ca6655$931ac960$6400a8c0@withoj2>
FirstTouchIP = 192.168.6.110