Endpoint Protection Small Business Edition reports that an email message was unable to be sent

Products

• Endpoint Protection Cloud
• Endpoint Protection Small Business Edition (Cloud)

Issue/Introduction

Emails fail to be sent and Symantec Endpoint Protection Small Business Edition (SEP SBE Cloud) displays an error asking you to re-send messages from Sent Messages.

Your email message was unable to be sent because the connection to your mail server was interrupted. Please open your email client and re-send the message from the Sent Messages folder.

Email Details

From
To
Subject

Cause

Communications or compliance issues with the mail server.

Resolution

• Option 1: Contact the E-Mail provider or application vendor to ensure full compliance with RFC 5321 (RSET in particular)
• Option 2: Check for and resolve network connectivity issues. Packet captures may reveal that the connection was lost or terminated unexpectedly
• Option 3: Change e-mail settings (SMTP server) to use an alternate port (Only incoming email will be scanned)
• Option 4: Disable the Email Protection option in the applied Endpoint Protection policy from the portal