Yes The mailbox of farid is on the host nuc.example.com.
It all should be straightforward :-) Assuming you have a standard
driver = passwd
lmtp needs farid as a username not farid@something.
Remove the mail address from your alias for now.
At least several years ago when I set the server up, I had to have the
alias from farid to fa...@example.com
Otherwise the email headers had traces of fa...@nuc.example.com.
Worry about that later.
I don't know why the from field is empty.
I sent the test e-mail by doing this: "/bin/sh /etc/daily".
$ echo test | sendmail farid
You received this mail because you are subscribed to email@example.com
To unsubscribe, send a mail to: misc+unsubscr...@opensmtpd.org