Why do I need an e-mail server to post?
Some programs (such as Agent) will not allow you to post until an e-mail server has been configured. This is because many newsreaders double as e-mail clients.
If you do not plan to use your client for e-mail, simply enter an invalid server, such as "noserver.invalid.com".
Most newsreaders do not require you to have an email server, but provide the option for one. For these, the field can remain blank.
Please be aware of the differences between an NNTP server and an e-mail server. They are completely different; an NNTP server allows you to read and post on Usenet newsgroups, while email servers give you the ability to read and send email via an email client.