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Try explicitly passing NULL, for example
p_to => NULL
or pass a fictitious email address, for example
p_to => 'firstname.lastname@example.org'
Who ever the bcc recipient is, may be you should give a meaningful "@nowhere.nada" so the recipient has some idea of where the email came from.
I tried the null in your first suggestion and it didn't work. Let me give the second suggestion a try.
Thanks for your help.