A number of people called with mail problems. This is mainly due to outdated mail server settings in client programs. Please check your setting and look if they conform to the following:

incoming mail (pop): pop.thing.net
outgoing mail (smtp): smtp.thing.net
username: yourname@thing.net or yourname@yourdomain.com

smtp now requires authentication. Enter your e-mail as username and the same password that you use for incoming mail. To protect your privacy, you can also turn on SSL or TSL authentication in your incoming and outgoing mail settings to request an encrypted connection.

You can find some more info about where to turn on authentication for different mail clients in the links provided in this document: http://www.css.qmul.ac.uk/mail/smtp/index.html
or check
http://www.iaw.com/smtpauth1.html