'Firebase Email Extension Not Sending To Full BCC List

my Firebase extension is triggering an email to send to a bcc list. It is working fine when the list is minimal (around 50). However, my bcc array list is now 1200 emails and the email is only successful for 99 emails of this list, the rest are going into the rejected field.

How can I debug this to even find where the problem is coming from? On the email it is connected to, I am getting about 5 emails saying the email receipient does not exist or it was rejected, not any notifications for the rest of the 1000+ emails not sent.



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