To use the Email Gateway, local organisations must ensure inbound/outbound connectivity to the following IP addresses is available from the organisation’s sending/receiving Message Transfer Agents (MTAs):
To test the connection to the Email Gateway IP’s, logon to the local MTA, and run the command ‘telnet <IP> 25’. The response should come back with: 220 SMTP-S or 220 SMTP-H. Below is an example of the successful output:
# telnet 220.127.116.11 25
Connected to 18.104.22.168.
Escape character is '^]'.
When configuring a connection to the Email Gateway by MTAs or applications, a hardcoded IP address is not recommended or supported. DNS should be used as it allows for dynamic service resiliency and failover.
What if testing fails?
1. Ensure the test is being executed from your MTA on N3/HSCN, and an appropriate PTR record exists.
2. Confirm your organisation's firewalls contain the following full IP ranges used for NHSmail (not just the IP addresses listed) which are: 22.214.171.124/26 and 10.222.62.0/24
If testing still fail contact the NHSmail support, as listed in the Where can I get help? section.