Uniform mails in spam box

Hi everyone,

I have a problem.
All the form mails go into spam.

What can I do to avoid this?

Template

<?php snippet('header') ?>
	<div class="content">
		<div class="container">
			<div class="row">
				<div class="offset-by-one ten columns">
					<h1><?php echo $page->title()->html() ?></h1>
					<?php echo $page->text()->kirbytext() ?>
					<h2><?php echo l::get('form') ?></h2>
					<form id="form" method="post">
						<div class="row">
							<div class="six columns">
								<input type="text" name="name" id="name" placeholder="<?php echo l::get('name') ?>" class="u-full-width" />
							</div>
							<div class="six columns">
								<input type="email" name="_from" id="email" placeholder="<?php echo l::get('email') ?>" class="u-full-width" />
							</div>
						</div>
						<div class="row">
							<div class="twelve columns">
								<textarea name="message" id="message" placeholder="<?php echo l::get('message') ?>" class="u-full-width"></textarea>
							</div>
						</div>
						<div class="row">
							<div class="twelve columns">
								<label class="form__potty" for="website" style="position: absolute;left: -9999px;">Please leave this field blank</label>
    							<input type="text" name="website" id="website" class="form__potty" style="position: absolute;left: -9999px;" />
								<input type="hidden" name="_submit" value="<?php echo uniform('contact-form')->token() ?>">
								<span id="feedback"></span>
								<button id="form-submit" type="submit"><?php echo l::get('submit') ?></button>
							</div>
						</div>
					</form>
				</div>
			</div>
		</div>
	</div>
	<script>
	window.onload = function () {
		$('#form-submit').click(function (e) {
			e.preventDefault();
			$.post(
				'<?php echo $page->children()->find('send')->url()?>',
				$('#form').serialize()
			)
			.then(function (response) {
				var feedback = $('#feedback');
				feedback.removeClass('success error').text(response.message);
				$('input, textarea').removeClass('erroneous');
				if (response.success) {
					feedback.addClass('success');
					$('input, textarea').prop('value', '');
					$('#form-submit').prop('disabled', 'disabled');
				} else {
					feedback.addClass('error');
					for (var i = response.errors.length - 1; i >= 0; i--) {
						$('[name="' + response.errors[i] + '"]').addClass('erroneous');
					};
				}
			});
		});
	};
	</script>
<?php snippet('footer') ?>

Controller

<?php

return function($site, $pages, $page) {

	$form = uniform(
		'contact-form',
		array(
			'required' => array(
				'name'      => '',
				'message'   => '',
				'_from'     => 'email'
			),
			'actions' => array(
				array(
					'_action' => 'email',
					'to'      => $site->to()->html(),
					'sender'  => $site->sender()->html(),
					'subject' => $site->subject()->html(),
					'service' => 'phpmailer',
					'snippet' => 'uniform'
				)
			)
		)
	);

	return compact('form');
};

The server you are sending from might be blacklisted. Are you sending from a remote server or localhost?

These google guidelines might be helpful: https://support.google.com/accounts/thread/51368464?hl=en