We already use <email address hidden> to explicitly throw away replies from automatic notifications that cannot handle replies (as opposed to <email address hidden>, which will one day have a bounce processor to flag obsolete email addresses)
What messages will we get sent to the address in the envelope sender?
Errors-To: header can keep set to <email address hidden> for all the bounces from modern mail handlers.
We already use <email address hidden> to explicitly throw away replies from automatic notifications that cannot handle replies (as opposed to <email address hidden>, which will one day have a bounce processor to flag obsolete email addresses)
What messages will we get sent to the address in the envelope sender?
Errors-To: header can keep set to <email address hidden> for all the bounces from modern mail handlers.