http://technet.microsoft.com/en-us/library/cc546055(WS.10).aspx

Many internet providers (Cable, DSL, Hotels, etc..) block your ability to send email through your domain and make you use their mail servers.  They do this to try and cut down on spammers using their high speed connections.  Forcing you to edit the configuation settings of your mail client (Outlook, Eudora, Thunderbird, etc) each time you use your computer in their environment.

However, there is a setting that you can use to alleviate this problem.  Follow these steps to setup your mail client.

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If your email account is setup to use “ActiveSync” (the server pushes mail to your iPhone or other SmartPhone) follow these steps.

Client configuration for iPhone

1. Go to the Settings app
2. Touch Mail,Contacts,Calendars
3. Add Account…
4. Microsoft Exchange (Note, only 1 ActiveSync account can be set up at once)
5. Fill out the Email (full email address), domain (your domain name),username (your username, not email address), password and description.Touch next.
6. After a moment, the iPhone will ask for a Server. Enter: webmail.microworks.net Touch Next
7. If your webmail does not support SSL, you will see “Exchange account verification failed.”
   1. Touch Next, then Save.
   2. After step 10, edit the account you just added.
   3. Touch Account Info
   4. Change “Use SSL” to “Off”
8. Select Mail, Contacts, Calendars to select which items you wish to synchronize.
9. Touch Done.

Client configuration for Windows Mobile

1. Click Start, Programs, ActiveSync.
2. Click the “set up your device to sync with it.” link.
3. Enter your Email address. Uncheck “Attempt to detect Exchange Server Settings automatically”. Hit Next.
4. For server address, enter webmail.microworks.net. Uncheck “This server requries an encrypted (SSL) connection”as desired. Hit Next.
5. Enter your username (without domain name), password and domain name. Hit Next
6. Choose to sync Contacts, Calendar, Email or Tasks and hit Finish.