Can I have PNG images in ads? Obviously, I will be a first time buyer.
I think it depends on the vendors, but mostly no, you only need to send text as the ad creative for the email swipe.
It all depends on the vendors. I'd suggest contacting the vendors before placing any orders if you need to use an image on your ad.
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It greatly reduces the deliverability and will kill conversions....17 years of email experience here ...so judge for yourself.