And actually never sent to CC neither.
Of course this is working and has been tested before, but if an email in the "To" is repeated in the "BCC" then that will make the BCC fail I think.
Or maybe your mail server has some other restrictions.
Max, ChronoForms developer
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No, it doesn't. Tested on production server, no BCC sent (using Sendmail option in J4)
Updated: During test I've set different emails to TO and BCC, and BCC worked on same server with same Sendmail option while being J3.5 + CF6.