SMTP Open Relay

HCL Notes/Domino 8.5 Forum (includes Notes Traveler)

Subject: SMTP Open Relay

Feedback Type: Question

Product Area: Domino Server

Technical Area: Administration

Platform: Windows

Release: 8.5.3

Reproducible: Unknown

Hi, we have a peculiar situation.

Over the past many years, we have been using our Domino Server (being the main mail server) as a open SMTP relay for other servers. Other servers(quite a few of them) use the SMTP service of Domino to route mails related to alerts/notifications.

Now, there was an audit against us and it was mentioned that we need to restrict this to only the approved servers as there is chance of SMTP spoofing internally. SMTP Authentication is out of question for the time being. Can I use the setting "Allow messages only from the following internet hosts to be sent to external internet domains:" in the SMTP Inbound Controls of the Configuration document? If yes, can I just enter the IPs or hostnames of the servers in this field?

Any inputs are welcome. Thanks in advance.

Feedback number WEBBB24CRX created by ~Evelyn Fronuteroni on 06/26/2018

Status: Open
Comments: