SMTP Test is a simple to use utility for testing connectivity to SMTP Servers.
With SMTP Test you can send test emails to SMTP Servers over any port, authenticated or non-authenticated and with or without encryption. (Encryption is determined by SMTP Test itself, but can be forced using a specific port number).
Any errors received are displayed exactly as the SMTP Server returns them to assist with troubleshooting connections.
Up to six family members will be able to use this app with Family Sharing enabled.