Duplicate primary Email validation in record.js

record.js

({
    extendsFrom: 'RecordView',
    initialize: function(options) {
        this._super('initialize', [options]);
        this.model.addValidationTask('check_email', _.bind(this._doValidateEmail, this));
    },
    _doValidateEmail: function(fields, errors, callback) {
        console.log("test function");
        _.each(this.model.get('email'), function(emailObject) {
            if (emailObject.primary_address) { //check if primary
                var primaryEmail = emailObject.email_address;
                 //do more things with the primary email
                var emailAddress = primaryEmail;
                var data = {
                        results: [],
                    },
                    options = {},
                    callbacks = {},
                    url;
                // add the search term to the URL params  
                options.q = emailAddress;

                // the first 10 results should be enough  
                //we can use 2 or 5 any number which is very less.  
                options.max_num = 10;

                // build the URL for fetching recipients that match the search term  
                url = app.api.buildURL('Mail', 'recipients/find', null, options);
                // create the callbacks  
                callbacks.success = function(result) {
                    var email_count = result.records.length; //Assigning the count of returned email addresses.  
                    console.log(email_count);
                    if (email_count > 0) {
                        errors['email'] = errors['email'] || {};
                        errors['email'].required = true;
                    }
                    callback(null, fields, errors);
                 };
                callbacks.error = function() {
                    console.log("api error");
                };
                app.api.call('read', url, null, callbacks);
            }
        });
    },
})