The phrase "a significant message to" is correct and usable in written English.
You can use it when referring to an important communication directed towards someone or a group.
Example: "The speaker delivered a significant message to the audience about the importance of climate change awareness."
Alternatives: "an important message for" or "a crucial message to".
The award of the 1984 Nobel Prize for Peace to Tutu sent a significant message to South African Pres.
"It sends a significant message to the market," said Hester le Roux, director of Gold Fields Mineral Services, a consultancy based in London.
The government has made some positive noises about a common sense amendment to the act [that], while a small amendment, would send a significant message to the countryside".
Speaking on state broadcaster RTÉ, Mr Ogle said the turnout at the anti-charge protests on Saturday sent a significant message to the government over the level of disquiet at local level.
Henderson said the small increase still sends a significant message to Saudi citizens.
If we all collectively participate, this strike has the potential to send a significant message to our leaders and society.
Mr Arafat is also frustrated by Mr Barak's decision to send an emissary to Washington to discuss renewing negotiations with Syria whilst not relaying any significant message to him since the election.
Michelle Stanistreet, the general secretary of the National Union of Journalists, said the strike sent a "really significant" message to BBC managers about union members' opposition to planned compulsory redundancies.
In the years since it was spawned as an urban street music in the ghettos of the Bronx, rap has devolved from socially significant message to black-teen bubblegum.
Supporters of the legislation contended it sent a significant message of bipartisan resolve to Iran at a time when the efficacy of the sanctions strategy has been increasingly called into question, largely because it has not dissuaded Iran from continuing to enrich uranium.
"It is quite clear a mass boycott has really sent this government a significant message it didn't want to hear," Luke Flanagan, one of the parliamentary deputies leading the opposition to the new household charge, said in an interview on Monday.
