Hello @JaneB169 ,
If you're encountering that level of blocked bounces, then there's either a specific element in that email that Gmail simply does not like, or it has something to do with the lack of self-authentication on your account. Since you have your own domain, I'd strongly advise getting your account's email self-authentication setup to alleviate the issue.
If you need specialized support or guidance regarding this, I'd advise reaching out to the Delivery team directly.
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