Display warning message

Hi Experts,
My view model has this code.

[Required]
[StringLength(50, ErrorMessage = "Your business email address may not exceed 50 characters.")]
[Email]
[DataType(DataType.EmailAddress)]
[DisplayName("Business email")]
public string BusinessEmail { get; set; }

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is it possible to add another  'not Required'  warning message when the EmailAddress contains a commercial domain. (For ex: if the email address is "test@yahoo.com" then there should be an warning message.

Please help!!