Hello @ThomasR172 ,
Regarding the spell check issue, our engineers are looking into it, so I've assigned your case to them. If and when they have an update they'll make sure to notify you.
As far as the test email goes, do you currently have your email client set up to automatically allow images to come through? With test sends, because they lack the authentication of live sends, some email clients are more wary of them, and may block certain elements or flag them as suspicious. Forwarding these tests, however, causes the email client to essentially rebuild the email with their own interpretation of the code. This can result in some differences upon forwarding, and if the forward comes from one of the forwardee's trusted senders, the images are more likely to show by default.
My recommendation is to check the security settings of your email client, to see if it's blocking images by default, or to see if there are any warning banners that you can use to set the test emails as safe.
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