Sending and Receiving Signed Messages
When you've installed and configured your digital ID, you can have Outlook automatically attach your digital ID to all messages you send, or manually attach the digital ID to specific messages you send. There's usually nothing wrong with attaching a digital ID to every message you send, but there are a few circumstances in which you might not want to do so:
If you routinely send email to recipients who can't decode digitally signed email (such as to a cellular phone or PDA), there's really no benefit to sending an email with a digital ID.
If the size of an email is ever an issue, consider not including your digital ID unless you absolutely need to. An email with an attached digital ID is at least 6KB larger ...
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