Mail si sent into spam

HI. I am facing a strange problem. I have made a separate mail.cs class file in which i have written the code for mail sending.
It is working fine in all the places. but only from one page when I sent the mail, the mail is sent into spam.


What may be the reason/ I am using the same code in all the project.
 this is my class file code




public void sendEmail(string toEmail, string message, string Subject)     {         try

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