On February 24, 2021, smtp.lbl.gov was reconfigured as a CNAME alias that uses Google's SMTP relay service (smtp-relay.gmail.com) instead of being an on-the-hill host (131.243.228.39).

Any on-the-hill systems (ie having an LBL Class B or NERSC IP address) will still be allowed to relay unauthenticated via smtp.lbl.gov and do not need to change their outgoing/outbound SMTP settings.

This change will only be an issue for hosts that do NOT have a route to the Internet, due to either their networking configuration and/or firewall rules, or can only connect to an IP address, as opposed to a hostname.

More information about the SMTP relaying reconfiguration plan is at:
https://go.lbl.gov/smtpRelayChange