Error message 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

Although we strongly advice our clients to use the smtp server of their internet provider, you can have good reasons wanting to use the smtp server we provide you with.

You may receive the following error message "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"
Read the following instructions carefully:
We recently upgraded our mailservers and applied a patch to enforce security and prevent spamming. You should look in to the settings of your smtp server in your mail software and enable "Secure authentication" through username and password. Then use the same username and password as for your pop3 server connection.

Configuring SMTP Authentication for Your Email Client(s)

Thunderbird (Mozilla)

If your ISP or e-mail service provider requires SMTP authentication for outgoing mail, you will need to use the "Use name and password" option for that SMTP server. Note: SMTP authentication has nothing to do with using a secure connection or any preferences in your POP or IMAP settings.

To set up Thunderbird (or SeaMonkey) to use authentication with your SMTP server:

• Go to "Tools -> Account Settings -> Outgoing Server (SMTP)".

(If using SeaMonkey: go to "Edit -> Mail & Newsgroup Account Settings -> Outgoing Server (SMTP)".)

• Select the server and press the Edit... button.
• Check the "Use name and password" option.
• Add your username. Your username might be your full e-mail address (e.g., "johndoe@example.com") or only the part before the "@" ("johndoe"), depending on your service provider; check with them which is correct.
• Click "OK".

Thunderbird will ask you for your password the first time you send email and you can optionally save it at that time.

Outlook 2000 or Outlook Express 2000
(Windows)

Launch Outlook 2000 and make sure it is the active window on your desktop. Then do the following.

1. From the Tools menu, select (click) Accounts...
2. In the "Internet Accounts" dialog box:
   1. Click the Mail tab.
   2. Select the email account to be SMTP-authenticated.
   3. Click the Properties… button.
3. In the "Account Properties" dialog box:
   1. Click the Server tab.
   2. Check My outgoing server requires authentication
   3. Click the Settings button.
4. In the "Outgoing Mail Server" dialog box:
   1. Check Use same settings as my incoming mail server
   2. Click OK to close the "Outgoing Mail Server" dialog box.
5. Click OK to close the "Account Properties" dialog box
6. Click Close to close the "Internet Accounts" dialog box

Outlook XP (Windows)

Launch Outlook XP and make sure it is the active window on your desktop. Then do the following.

1. From the Tools menu, select (click) Email Accounts...
2. In the "E-mail Accounts" dialog box:
   1. Check View or change existing e-mail accounts
   2. Click the Next button.
   3. Select the email account to be SMTP-authenticated.
   4. Click the Change… button.
   5. Click the More Settings… button.
3. In the "Internet E-mail Settings" dialog box:
   1. Click the Outgoing Server tab.
   2. Check My outgoing server (SMTP) requires authentication
   3. Check Use same settings as my incoming mail server
   4. Click OK to close the "Internet E-mail Settings" dialog box.
4. In the "E-mail Accounts" dialog box click the Next> button and then click the Finish button.

Outlook Express (Macintosh OS 9)

Launch Outlook Express 5 and make sure that it is the active window on your desktop. Then do the following.

1. From the Tools menu, select (click) Accounts
2. Click the Mail tab and then:
   1. Select the e-mail account to be SMTP-authenticated.
   2. Click the Edit button.
3. In the "Edit Account" dialog box, under "Sending Mail, SMTP Server":
   1. Click the Click here for advanced sending options button.
   2. Choose (click) SMTP requires authentication
   3. Check Use same settings as incoming mail server
   4. Close dialog box by clicking the X on the upper left hand corner.
4. Click the OK button to close the "Edit Account" dialog box.
5. Close the "Accounts" dialog box by clicking the X in the upper left hand corner.

OS X Mail (Macintosh OS X)

Launch OS X mail and make sure that it is the active window on your desktop. Then do the following.

1. From the Mail menu, select (click) Preferences
2. In the "Accounts" dialog box, select the e-mail account to be SMTP-authenticated and then click the Edit button.
3. In the new Accounts dialog box:
   1. Select the "Account Information" tab.
   2. Under "Outgoing Mail Server:" click the Options button.
4. In the SMTP Server Options dialog box:
   1. For "Method of Authentication" choose Password
   2. In the "User Name" text box, enter your campus account ID.
   3. In the "Password" text box, enter the password for your campus account.
   4. Click the OK button to close the "SMTP Server Options" dialog box.
5. Click the OK button to close the "Accounts" dialog box.
6. Click the Close button.

Eudora 5.1 (Windows)

Launch Eudora 5.1 and make sure it is the active window on your desktop. Then do the following.

1. From the Tools menu, select (click) Options...
2. In the "Category" area of the "Options" dialog box, click Getting Started
3. Under "SMTP Server (Outgoing)" check Allow Authentication
4. In the "Category" area, click Sending Mail
5. Check Allow Authentication
6. Click the OK button to close the "Options" dialog box.