Can't send links in mails sended from PHP GAE using mail API
<p>I have an applications running in Google App Engine for PHP. Users can register and then they receive a link to confirm registration.</p>

<p>This was working fine until february 14, 2016. After then, emails that contain links are not sended and no error nor exception is triggered.</p>

<p>This is the code i use to send the email. Nothing has changed in the application for months. Mails sended from a contact form page that uses the same function are delivered ok except those that contain a link in the body (Ex: www.anything.com). If i separate links with spaces, for example, then mails are sended normally (www .anything .com)</p>

<pre><code>function sendMail($to, $subject, $textBody) {
    $result = true;
    $mail_options = [
        "sender" =&gt; "yyyy@zzzz.appspotmail.com",
        "to" =&gt; $to,
        "subject" =&gt; $subject,
        "textBody" =&gt; $textBody
    ];

    try {
        $message = new Message($mail_options);
        $message-&gt;send();
    } catch (InvalidArgumentException $e) {
        $result = false;
    }
    return $result;
}
</code></pre>

<p>Emails are not received in spam folder neither so it seems that are not sended.
Any ideas?</p>

<p>Thanks.</p>