If you're using authentication, you've confirmed that our domains are safelisted in your network / security programs, that your email address is safelisted, and that you've gone through basic connectivity trobuleshooting (like clearing your cache for example), then please call our general support so they can perform live troubleshooting.
If you have any examples of this happening when you test / live send to other email addresses, it can also help with our support teams pinpointing where this issue is specifically originating from.
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