I haven't, personally, though there is always a chance that I have had low rates of failures that I haven't noticed. Said personal domain is a .hk domain though

I haven't, personally, though there is always a chance that I have had low rates of failures that I haven't noticed. Said personal domain is a .hk domain though, and I have had an issue where US defense-contractor type domains silently block all email from China or China adjacent domains or IP blocks.