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Paste it in.
Changing it laterCome back here, copy again and replace the old signature completely. Mail apps keep their own copy of the card, so editing in place won't pick up a new one.
Older OutlookClassic desktop Outlook shows the first frame of the card, and that frame is designed to stand on its own.
Images turned off?Your name, title and links are real text, so they stay readable even when someone blocks images.