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PNG file names showing up on email subject lines

There seems to be a weird glitch of some sort where my PNG file names show up on the email subject lines for our newsletter tests and releases. Shouldn't that be hidden?

E-mail Marketing

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Free webinar, "Getting Seen: Sharing Your Passion to Build Authentic Connections," January 29, 2026, 2:00 pm ET.

PNG file names showing up on email subject lines

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