Errors like Server not found, server not responding, server does not have a DNS entry, are usually caused by 3 things.
Outlook Express 4, 5, & 6 (Windows): Click the Tools menu and choose Accounts. Click onto the Mail tab, highlight your Expedient email account, and click the Properties button. When the Properties window opens, click the Servers tab at the top. Check your Incoming and Outgoing server names, correct them if necessary.. Click OK, then close the Internet Accounts window and try to check your email again.
Outlook Express 5 (Macintosh): Click the Tools menu and choose Accounts. Click the Mail tab, highlight your Expedient account and click the Edit button. Check your Incoming and Outgoing server names, correct them if necessary. Click OK, then close the Accounts window and try to check your email again.
Outlook Express 4.5 (Macintosh): Click the Edit menu and choose Preferences. Click the E-mail category on the left side. Check the SMTP server and POP Servers -- these are your Incoming and outgoing email servers -- correct them if necessary. Click OK, then try to check your email again.
Netscape 7: In the email program, click the Edit menu and choose Mail/News Account Settings. Check the Server setting below your username. If necessary, correct the Server Name. Check your Outgoing (SMTP), correct it if necessary. Click OK, then try to check your email again.
Netscape 4.5 to 4.7: Click the Edit menu and choose Preferences. Expand the Mail & Newsgroups category if necessary, and choose Mail Servers. Check your Incoming mail server. If it is incorrect, correct it by clicking the Edit button. Check your Outgoing mail server, correct it if necessary. Click OK, and try to check your email again.
Eudora Light: Click the Tools menu and choose Options (Macintosh click the Special menu and choose Settings). Highlight the Hosts Category on the left side. Check your POP account, it should be in the format of yourusername@yourmailserver (example: johndoe@mail.expedient.net). POP account is not your email address! Check the SMTP, this should just be the mail server name. Click OK, then try to check your email again.
Eudora Pro: Click the Tools menu and choose Options (Macintosh click the Special menu and choose Settings). Highlight the Getting Started Category on the left side. Check your Mail Server (Incoming) and SMTP Server (Outgoing), make corrections if necessary. Click OK, then try to check your email again.
OS X Mail: Click the Mail menu and choose Preferences. Highlight your Expedient mail account and click the Edit button. Check the Host Name and SMTP Host, make corrections if necessary. Click OK, close the Mail preferences window, then try to check your email again.