Turn off encryption while sending mails to gmail from the outlook using microsoft graph api in Rust - Stack Overflow

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I am using microsoft graph api to send mails to both outlook/outlook based emails and gmails for email verification from my outlook email. The user is receiving the mails but in case of gmail based emails, the otp message which i wanna show is going as protected message/encrypted one. I tried adding headers to the mail content, still wasnt useful. Also i am using Rust to do this. And here is my send_email fn in rust.

// sending email
pub async fn send_email(pool: &PgPool, recipient: &str, otp: &str) -> Result<(), Box<dyn std::error::Error>> {
    let access_token = get_access_token(pool).await?;
    let config = get_configuration().expect("Failed to read configuration");

    let sender_email = &config.oauth.sender_email;
    
    // Create HTML formatted email body
    let html_content = format!(
        r#"
        <div style="font-family: Arial, sans-serif; padding: 20px; max-width: 600px;">
            <p>Dear Customer,</p>
            <p>Thank you for showing interest in our SaaS Application.</p>
            <p>To verify your email, please enter the following One Time Password (OTP):</p>
            <p style="font-size: 18px; font-weight: bold;">{}</p>
            <p>The OTP is valid for <strong>3</strong> minutes from the receipt of this email.</p>
            <p>If you did not request this OTP, please ignore this email.</p>
            <p>Thank you</p>
        </div>
        "#,
        otp
    );

    let client = Client::new();
    let email_body = json!({
        "message": {
            "subject": "Your OTP Code",
            "body": {
                "contentType": "HTML",
                "content": html_content
            },
            "toRecipients": [{
                "emailAddress": { "address": recipient }
            }],
            "from": {
                "emailAddress": { "address": sender_email }
            },
            "importance": "normal",
            "internetMessageHeaders": [
                {
                    "name": "X-Microsoft-Exchange-Organization-SkipSafeLinksProcessing",
                    "value": "1"
                },
                {
                    "name": "X-Microsoft-Exchange-Organization-SkipSafeAttachmentsProcessing",
                    "value": "1"
                },
                {
                    "name": "X-MS-Exchange-Organization-Classification",
                    "value": "Normal"
                },
                {
                    "name": "X-MS-Exchange-Organization-Message-Timestamp",
                    "value": chrono::Utc::now().to_rfc3339()
                },
                {
                    "name": "X-Proofpoint-Encrypt",
                    "value": "off"
                }
            ]
        },
        "saveToSentItems": "false"
    });
        

    let response = client
        .post(".0/me/sendMail")
        .header("Authorization", format!("Bearer {}", access_token))
        .header("Content-Type", "application/json")
        .json(&email_body)
        .send()
        .await?;

    if response.status().is_success() {
        Ok(())
    } else {
        let error_text = response.text().await?;
        Err(format!("Failed to send email: {}", error_text).into())
    }
}

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