This resource provides you a small PHP Script that allows you to test your SMTP Server.
Configurations
$smtpHost: SMTP Server Hostname (Domain or IP)
$smtpPort: SMTP Server Port
$smtpUsername: SMTP Server Username
$smtpPassword: SMTP Server Password
$senderEmail: The Email Address that the Email will be sending from
$senderName: The sender name of the email
$recipientEmail: The Email Address that the email will be sent o
$recipientName: The recipient name of the email