'Grant' Word 403 Forbidden Issue in Ajax Form Submission

Question

403 Forbidden Issue with 'grant' (example: [email protected]) word in email ID if we send an email to multiple email IDs. When we send mail to a single email (including [email protected]) to anyone, it's working fine.

However, when we select multiple email addresses to send, it shows a 403 forbidden error if we include the email/word 'grant'.

If we send emails to multiple addresses excluding '[email protected]', it works fine. Please check and let us know if there is any solution.

Here is my code:

function trpMailingSend() {
try {
    var e = $("#trpMailingSendForm").serializeArray(),
        t = new FormData;
    $.each(e, (function(e, n) {
        t.append(n.name, n.value)
    })), "" != $("#imageFileAdd").val() && (t.append("filePdf", $("#imageFileAdd")[0].files[0]), t.append("filePdfFile", $("#imageFileAdd")[0].files[0].name)), $.ajax({
        type: "POST",
        url: '#APPLICATION.navigation.getURL("mailing", "trpMailingSend")#',
        data: t,
        dataType: "json",
        contentType: !1,
        cache: !1,
        processData: !1,
        error: function(e, t, n) {
            console.log(e), console.log(t), console.log(n), 403 === e.status ? (console.error("403 Forbidden: Access Denied"), "" !== e.responseText.trim() ? console.error("Response Text:", e.responseText) : console.error("Server did not provide additional information.")) : console.error("An error occurred:", n)
        },
        success: function(e) {
            if ("1" == e.status) {
                showPopOver("{{There was an error sending emails. Our development team has been notified of the problem and will contact you when it is fixed.}}", "sendEmailBtn", '<DIV CLASS="group-btn text-center" STYLE="min-width:81px;">\t\t\t\t\t\t\t\t\t\t\t\t<A CLASS="btn btn-danger btn-xs" ONCLICK="hidePopOver();">{{Ok}}</A>\t\t\t\t\t\t\t\t\t\t\t</DIV>')
            } else messageSystem.showMessage("{{E-mail(s) were sent successfully!}}", "4", "", "goPage('mailing', 'trpMailingInfo', " + e.data + ", '?ret=<CFIF isDefined(trpId)>1<CFELSE>2</CFIF>');");
            console.log("test2"), console.log(e)
        }
    })
} catch (e) {
    console.error("An error occurred:", e)
 }
}