Welcome to IP 
1. Those settings don’t seem quite correct to me…it is unlikely you would have the same port for incoming and outgoing mail and even more strange your smtp port would be 143.
I know you said they work in Thunderbird but port 143 normal refers to IMAP incoming mail. I would double check with your provider for the SMTP port (the default port is 25 for smtp although most hosting providers change this).
Once you have confirmed the correct port you will most probably also have to change the ‘Security’ setting in IP to SSL/TLS.
2. Please refer to this post… Guest Payment showing a Credit Card form