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→Backup MX and SPAM Filtering
So:
So:
* If you trust the secondary MX, you _will_ accept a lot of SPAM when the link comes up.
* If you trust the secondary MX, you <u>will</u> accept a lot of SPAM when the link comes up.
* If you don't trust it, you will cause a lot of SPAM backscatter as the mail has been accepted at the secondary MX and then later bounced by you.
* If you don't trust it, you will cause a lot of SPAM backscatter as the mail has been accepted at the secondary MX and then later bounced by you.
* Stopping backscatter is why SME Server rejects invalid addresses during the initial SMTP transaction.
* Stopping backscatter is why SME Server rejects invalid addresses during the initial SMTP transaction.
