The phrase "a message that informs" is correct and usable in written English.
You can use it when describing a type of communication that conveys information or knowledge to the recipient.
Example: "The report was clear and concise, serving as a message that informs the stakeholders about the project's progress."
Alternatives: "an informative message" or "a message that conveys information".
When someone using a normal phone calls the toll-free number, he hears a message that informs him that he will be charged -- typically 10 cents a minute -- to reach the wireless subscriber, who would then receive the call without fees.
In those cases, Hulu displays a message that informs viewers that the selected content is not available as part of Hulu's ad-free service and that a commercial will play both before and after the program.
This includes one of the actresses from the first season, who will now have to be replaced with a new face and a bold message that informs the viewer why she couldn't play her part: because of the Syrian regime.
The relay vehicle is selected as the one whose contention window expires first and it sends a CTB message that informs other vehicles to cancel their rebroadcast.
Still absent is a cohesive message that informs the American people what exactly the Democratic Party is for, aside from being against Trump, and recent evidence shows Republicans may be gaining ground in the political battle.
Whenever a node wakes up, it sends an ID message that informs neighbor nodes that the node is ready to receive data.
When you start a chat with another user, they're notified both in the app and via an email message that informs them of the chat and offers a button which, when clicked, launches Evernote.
To periodically update that information, the system uses proprietary algorithms to generate a tiny, encrypted wireless message that informs each lock who has permission to enter.
In that case, ALG software will still provide genotyping calls but they will come with warning messages that inform users of the possible non-normality of the data.
Furthermore, hospitals introduced a messaging system that informed fathers about the pregnancies of their daughters, adding further pressure on women in a country where sex outside of marriage is considered largely unacceptable.
As Mary Anne tells it, she called the Torrance courthouse only to get a recorded message that informed her they would have to be married downtown.
