Exchange Server 2007: Can the quarantine mailbox be an external smtp address?

by Bharat Suneja

In Tuesday’s Birds of a Feather (BOF) session on Fighting Spam with Exchange Server 2007, someone from the audience wanted to know if an external (smtp) email address can be used as a quarantine mailbox. Exchange does no validation of the email address used for a quarantine mailbox – as long as it’s a valid smtp address, it can be used.

However, the results may not be what one’s looking for. The quarantined message appears as a NDR. Outlook knows how to treat it correctly using the Send Again functionality, which won’t happen if you’re forwarding quarantined messages to an external address. The From headers will not be rewritten to identify the original sender of the message.

So yes, it can be done – but what’s the point?

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