You can find Serial Key in your account at plumrocket.com. For manual click here.
Create or edit your Email Gateway on this page Manage Email Gateways
SMTP server name or IP address.
Default ports: 25, 465, or 587. Port 465 (coupled with SSL encryption), Port 587 (coupled with TLS encryption).
For most servers SSL is the recommended option.
Please choose your authentication method.
Sandbox mode blocks all emails from being sent. Please note, all emails are saved in the Email log regardless of the selected mode.
Set to 'Enabled' to save sent email history.
Automatically clear log entries after the specified number of days. If set '0' the log will not be erased.