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Here's a quick explanation of all the fields:

    Description: it's an informal name associated to your SMTP server.
    Server name: the actual SMTP specification. Below you find a handy list of all the server names for the most common email providers.
    Port: SMTP servers normally use port 25 to work, but there are other options.
    Connection security: the standard SMTP email transfer goes without encryption, so it can be a good idea to secure it with STARTTLS or SSL/TLS.
    Authentication method: it can be a plain text password, a cyphered one, POP before SMTP, CRAM-MD5, KERBEROS, NTLM, etc.
    User Name: your email address.

And here's a list of the most popular server names. If you don't find yours, check out our article about "What is my SMTP" or contact your email provider.