Hello @AmyD19027 ,
Is this something that has occurred recently? Is this only affecting iPhone mail app users, or affecting other devices and email programs/apps?
Does the image issue continue if you set your account up for self-authentication instead of your current setup? If the receiving apps/programs aren't trusting the sending since it's being authenticated through a 3rd party instead of your direct domain, it can cause issues with everything from delivery to what's allowed to display in the email.
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