There is no way to delay in email piping. If your server does not delay to send email then this should work immediately.
Do you have cpanel? If yes, then give me access to your webisite(cPanel, website admin & ftp) so that i can try to setup for you.
Please use “contact-form[a t]shamimsplugins.com” email address as admin user so that i can receive email for testing.
Full backup your website before giving me access.