Not able to send emails from roundcube. Roundcube stucks while sending the email (after clicking on Send Now)

Here are the steps to get this fixed :)

Open the file

vi /usr/local/cpanel/base/3rdparty/roundcube/config/main.inc.php

Find for

$rcmail_config['smtp_pass'] = ”;
$rcmail_config['smtp_user'] = ”;

You will find the %u %p in the single quotes. Remove or add them accordingly.

Try sending email now.