Symanec Protection Suites

I am using Symantec Endpoint Protection version 11.0.5002.333 on three XP+SP3 destops. I keep getting the following "Symantec Email Proxy" error message after sending email: "Your email message was unable to be sent because your mail server rejected the message: 421 Resources temporarily unavailable - Please try again later" There is a link on the error message popup that always points to a “Upgrade your Norton product” page. I have been getting this error periodically for over a year. It does not happen every day, but has occurred several times on the same day. I have to resend the email, sometimes several times. What is the cause and, more importantly, the solution.

Hi John,

refer below

https://www-secure.symantec.com/connect/forums/symantec-email-proxy-4

https://www-secure.symantec.com/connect/forums/email-proxy

 

Hi,

It's advisable your antivirus version are almost 3 moths years old.you can upgrade latest SEP version.

Did you try Disable NTP feature ?

Could you please try disable outlook scanner on 1 machine as a test on which you see this message .

go to add remove select sep change modify custom and disable outlook scanner and follow the wizard and observe this machine for event logs etc.

We are having the same issue and not finding the links you provided helpful.

 

Symantec Email Proxy

Your email message was unable to be sent because your mail server rejected the message:

421 Unexpected failure, please try later

1003, 10

 

We use Microsoft Outlook.

It looks as if Network Threat Protection  had its definitions updated on 03/01/2013 "r2".  Could this be the issue? 

Please advise, thank you.