As part of troubleshooting an email routing issue or acting proactively to ensure the best performance on your email server, you are looking for ways to improve performance on your Windows OS email server.
Your organization has a Windows based email server, and either Symantec Antivirus (SAV) or Symantec Endpoint Protection (SEP) with the email scanning tools installed.
The Symantec Antivirus and Symantec Endpoint Protection clients come with optional email scanning features that are excellent on a workstation, but may slow down or interfere with email processing on a mail server. The Internet Email Tools plug-in is not engineered to interact with the volumes and technologies involved in mail processing on a mail server. Issues can arise including:
Slow email delivery
Unscannable email verdicts due to time-outs in the email scanning process
Unexplained and unusual email delivery
Legitimate emails being caught under a verdict of spam or virus.
The email scanning components of Symantec Antivirus and Symantec Endpoint Protection should be removed from any server utilizing email services.