Hi, i have 2 installations of iRedMail. Deployed via installer od Debian 10 with Nginx and MySQL. Work like a charm. But i need option always_bcc. Ok i add directive to main.cf. Work - but in system i have error message:

<archive.ua@mail.domain.local> (expanded from <archive.ua>): unknown
    user: "archive.ua"

I use fetchmail to get mails from external mailboxes, script is fetched from postfix github.And work without any problems.

On second server is similiar message witch different user. I not create this user, bcc address is created correctly and have bcc's mails. Sender address is vmail.

So, why local user vmail want to send mails to non existents and not configured elsewhere mailbox? I not have even similiar account, domain, or else.....