SMTP Prevent fails to detect on message and creates error " 554:Smtp_Message.5300 Error while processing message "

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Article ID: 159703

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Updated On:

Products

Data Loss Prevention Network Prevent for Email

Issue/Introduction

SMTP Prevent fails to process a message and responds with " 554:Smtp_Message.5300 Error while processing message "


Resolution

Symptom:

The File reader log shows the following entries

5300  Error while processing message (cid=1 message_id=<> dlp_id=11b9a6f4b02 size=0 sender=<tmw> recipient_count=1 disposition=ERROR code=554 estatus=5.5.7 rtime=<> dtime=<> mtime=20.45s reason=554 5.5.7 Fatal: Malformed message content.) 
5301  Sender rejected during re-submit 
5302  Recipient rejected during re-submit 

Issue:

The message has to create fully RFC 2821 (RFC 821) compliant communication with the MTA. See as reference KB 54131
The seen error message is typical when a non-RFC compliant message is encountered. Please review the communication between the MTA and SMTP Prevent.