Hello @ShariseM ,
Unfortunately, the majority of email programs either do not support this, or will simply strip this formatting from the text upon delivering to inboxes, rendering the functionality moot. At this time we do no offer the ability to format subject line text, beyond the standard personalization coding and emoji availability.
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Because we have not heard back we are going to close this idea. This doesn't mean that we aren't listening to your feedback! Please feel free to comment or vote on any of the other open ideas to let us know what you would like to see.
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