[KB3346] Spam emails with a null sender address are not quarantined by ESET Mail Security for Microsoft Exchange Server

Issue

Create a Transport rule in Microsoft Exchange that redirects emails with null sender addresses to a specified quarantine mailbox

Details

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Although you can configure ESET Mail Security for Microsoft Exchange Server to delete all emails marked as spam, the downside is that if a legitimate email is deleted, it cannot be restored locally. A Transport rule in Microsoft Exchange that redirects emails enables you to restore a legitimate message if it is incorrectly flagged as spam.

Solution

Click Start, type exchange administrative center, and click Exchange Administrative Center.
Type your Domain\user name and Password and click sign in.
Click mail flow, click the plus icon, and select Create a new rule.
Type a name for the rule into the Name field and click More options.
From the Apply this rule if drop-down menu, select A message header → includes any of these words.
Click Enter text, type Return-Path into the specify header name field, and click OK.
Click Enter words, type <> into the specify words or phrases field, and click the plus icon → OK.
From the Do the following drop-down menu, select Redirect the message to → these recipients.
Select your quarantine mailbox and click add → OK.
Click add exception to create exceptions to exclude the text patterns used in out-of-office emails, non-delivery reports (NDRs), and/or delivery status notifications (DSNs) to keep these messages from being quarantined even though they use a null sender address.
From the Except if drop-down menu, select The subject or body → subject or body matches these text patterns.
Into the specify words or phrases field, type the text patterns you want to create exceptions for, and click the plus icon after each one. We recommend that you include the patterns Automatic reply: and Undeliverable: because these are both commonly used by Microsoft Exchange to denote messages with null sender fields. You may also want to add certain patterns commonly used in out-of-office emails.

Click OK → Save to save the rule.