On February, 24 2021, smtp.lbl.gov was redirected and now uses Google's SMTP relay service (smtp-relay.gmail.com)
New Outbound email configuration
All on-the-hill IPv4 hosts (systems with an LBL Class B or NERSC IPv4 address) are still 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.
Testing
You can test whether a host can connect to Google's SMTP relay service by changing its configuration to use smtp-relay.gmail.com and then send a test email OR by running the following command from the host's command line (ports 465 and 587 are substitutable for port 25):
telnet smtp-relay.gmail.com 25
If you get the following response, then your host was able to connect to Google's SMTP relay service and you won't need to make any changes:
Connected to smtp-relay.gmail.com. Escape character is '^]'. 220 smtp-relay.gmail.com ESMTP stringOfLettersAndNumbers.Num - gsmtp
If your host(s) return a 'Operation timed out' and/or 'No route to host,' or you just know are unable to connect to Google, then you will need to modify any host and/or network firewall configurations that are preventing an outbound SMTP connection to smtp-relay.gmail.com
Google Workspace SMTP relay service documentation
Route outgoing non-Gmail messages through Google: https://support.google.com/a/answer/2956491
Send email from a printer, scanner, or app: https://support.google.com/a/answer/176600
