mail-mta/opensmtpd-6.0.2_p1 was apparently deleted because of bug #683284.
mail-mta/opensmtpd-6.0.3_p1-r1 is unstable and may have bug #670632.
mail-mta/opensmtpd-6.4.0_p1 isn't even unstable, probably due to being LibreSSL-only.
Can we either get:
1. mail-mta/opensmtpd-6.0.2_p1-r1 with virtual/pam dependency removed, or
2. mail-mta/opensmtpd-6.0.3_p1-r1 stabilized?
I'm not sure "unmask the unstable one" is the right choice, but I will if I must.