I've just made a configuration mistake that'll likely put me on all
blacklists in this universe. But asides that, I guess I have a more
question about the way opensmtpd handles recipient verification.
Accepting mails for user known to the system works, but what I haven't
though about, are mailing lists. And probably, also mails to be
[B]CC could be affected.
As those are not directly adressed to any account known to the system,
f.e "firstname.lastname@example.org", opensmtpd rejects them with an "550 Invalid
That is a problem I have currently no idea on how to deal with this.