https://wiki.openjdk.org/display/SKARA#Skara-OpenJDKEmail seems to imply that an alias is supposed to be created for {username}@openjdk.org that forwards to the primary email for the SSO profile. Attempting to send an email to jcking@openjdk.org bounces, failing to be delivered. I believe I did the pre-requisite already in https://bugs.openjdk.org/browse/SKARA-1685. Not sure if that section is maybe out of date and no longer necessary, or maybe the aliases are not a thing anymore.

Thanks!