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Norton blocking outgoing email - email error 421 4.7.0
When trying to reply to an email in Windows Live Mail, Norton blocked the outgoing email with error message: "421 4.7.0 relay02.cambriumhosting.nl Error: to many errors"
Although in Windows Live Mail the email moved to the "Sent Items" folder, after checking it was 100% clear that it not reached the receiver. Then I disabled the email protection in Norton, and the email reached the receiver without a problem.
To be clear: there were NO ATTACHTMENTS in this email. Just plain text, nothing else.
This is not the first time Norton Security blocks my outgoing email. Few weeks ago I sent an email with a lot of Bcc's (also just plain text and no attachments). That too was blocked by Norton (email error 554 5.7.1 with the message "Recipient address rejected: Too many mails sent from your host within the last 10 minutes"). And that also could only be circumvented by disabling the email protection in Norton.
Today my Norton updated from version 126.96.36.199 to 188.8.131.52. But this issue stills exists.