I'm using postfix smtp and adding always_bcc.
always_bcc = firstname.lastname@example.org
It's working fine without attachment. When I add attachment, auto bcc is not working and admin didn't get email.
How to fix that problem ?
This is not answer i just trying to say a way to debug your postifx server configuration
and see the postfix Troubleshooting process here
also see Postfix sends all log messages to /var/log/mail.log. However error and warning messages can sometimes get lost in the normal log output so they are also logged to /var/log/mail.err and /var/log/mail.warn respectively.