There are no options, and the app just spins when trying to send an email.
Also Very Disappointed
The sales pitch is somewhat deceptive, you do not actually see exactly what the SMTP server is saying as is implied, you get a single interpretation of the error message. In my case, that message was “an unknown error occurred” using this app. Doing a test manually with Telnet the error was “server requires authentication.” So, even the single message this app returns in not necesarily going to be useful. If you are looking for an app to show the entire SMTP conversation to be able to diaganose where in that conversation an SMTP connection to another server is failing, this app is not it. Also, you are only able to “test” the sending of an email, not the retrieveing of emails if you are trying to diagnose problems getting email from a POP or IMAP server. What this app does let you do is enter the hostname you want to test, the port on that host you want to test, the option to use authentication and the username and password to use if authenitcation is desired. You then give a sender email address and the recipients email address, a subject and the message body and you send the email. You get a message window pop-up with suposedly the actual SMTP error message, though this was not my experience. The “test" this app does is no more useful than using Mail.app to send an email. I do not reccomend this app. Using Terminal and SMTP commands manually via telnet is unfortunately still the best way I’ve found on OS X to diagnose problems with sending an receiving email.
I tried a very simple connection test against my Mac OS X mountain lion server (smtp) and it failed. That was ok except that the application did not provide a single log to help determine what went wrong. I have the smtp server turned on with debug (level 3) and verbose settings for the smtp deamon, however, I also need to see the errors from the client side. I need to test various configuration scenarios to ensure that my servers can properly receive e-mails from the wide public internet. This tool does not give me that.