Yii2-ticket-support includes special component named Mailer, which is used to send emails in four different instances:
Mailer can be configured as followed:
...
'support' => [
'class' => 'akiraz2\support\Module',
'mailer' => [
'sender' => 'support@myhost.com', // or ['support@myhost.com' => 'Technical Support']
],
...