Hi Kage, how strange, I assume you are also on the latest version of MailCow, correct?
Could you confirm me your configuration in main.cf looking for the entries of bcc_maps.
I have:
proxy:mysql:/opt/postfix/conf/sql/mysql_tls_enforce_in_policy.cf,
$sender_dependent_default_transport_maps,
$smtp_tls_policy_maps,
$local_recipient_maps,
$mydestination,
$virtual_alias_maps,
$virtual_alias_domains,
$virtual_mailbox_maps,
$virtual_mailbox_domains,
$relay_recipient_maps,
$relay_domains,
$canonical_maps,
$sender_canonical_maps,
$sender_bcc_maps,
$recipient_bcc_maps,
$recipient_canonical_maps,
$relocated_maps,
$transport_maps,
$mynetworks,
$smtpd_sender_login_maps,
$smtp_sasl_password_maps
#recipient_bcc_maps = proxy:mysql:/opt/postfix/conf/sql/mysql_recipient_bcc_maps.cf
#sender_bcc_maps = proxy:mysql:/opt/postfix/conf/sql/mysql_sender_bcc_maps.cf
Thanks, Bernardo.
Kage_