Both LibreSSL and the latest version of OpenSSL lack definitions for
SSLv3_method, so handle that case to fix the build with those SSL options.
Appoved by: SSL blanket
On system without any IPv6 addresses emailrelay fails to start with messages:
# service emailrelay start
emailrelay: error: cannot bind the listening port: :::25
emailrelay: exception: cannot bind the listening port: :::25
/usr/local/etc/rc.d/emailrelay: WARNING: failed to start emailrelay
PR: 204126
Submitted by: Dmitry Afanasiev
Approved by: maintainer timeout
