Message: Error:0x800CCC78 The message could not be sent because the server rejected...

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Message: Error:0x800CCC78 The message could not be sent because the server rejected...

You may be seeing the message "Error: 0x800CCC78 The message could not be sent because the server rejected the sender's email address" while using an external email program because the program is using an invalid port to send email. After completing each solution, check to see if you can send email without issue. If you are still unable to send email without issue, contact the manufacturer of the email program you are using.

You may wish to print or save a copy of these instructions as this page may not remain visible as you go through the suggested steps.

Information You Need

You will need to know what email program you are using to access AOL Mail when you received the message.

Solutions


Set Outgoing Mail Port to 587 in Outlook Express, Outlook 2000 and Outlook 2002/2003

To change the outgoing mail port to 587 in Outlook Express and Outlook 2000:
1. Open Outlook Express or Outlook 2000.
2. Click the Tools menu, then clickAccounts.
3. Click your email account, then click the Properties button.
4. Click the Advanced tab.
5. In the Outgoing Mail (SMTP) box, type587.
6. Click the OK button.
7. Click the Close button.

To change the outgoing mail port to 587 in Outlook 2002/2003:
1. Open Outlook 2002 or 2003.
2. Click the Tools menu, then clickemail Accounts.
3. Click the View or change existing email accounts option, then click the Next button.
4. Click your email account, then click the Change button.
5. Click the More Settings button.
6. Click the Advanced tab.
7. In the Outgoing Mail (SMTP) box type587.
8. Click the OK button.
9. Click the Next button.
10. Click the Finish button.

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Set Outgoing Mail Port to 587 in Eudora

To change the outgoing mail port to 587:
1. Open Eudora.
2. Click the Tools menu, then clickOptions.
3. Scroll down to, then click Ports.
4. In the SMTP Port (25): box, type 587.
5. Click OK button.
6. Restart Eudora.

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Set Outgoing Mail Port to 587 in Entourage for Mac

To change the outgoing mail port to 587:
1. Open Entourage for Mac.
2. Click the Tools menu, the clickAccounts.
3. Click your email account, then click the Edit button.
4. Click the Click Here for Advanced Sending Options link.
5. Click the Override Default SMTP Port box to place a check mark in it.
6. In the SMTP Port box, type 587.
7. Close the Settings window.
8. Click the OK button.
9. Close the Accounts window.

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Set Outgoing Mail Port to 587 in Mail.app (default for Mac OSX)

To change the outgoing mail port to 587:
1. Open Mail.
2. Click the Mail menu, then clickPreferences.
3. Click the Accounts icon.
4. Click the Account Information tab.
5. Click the Server Settings button.
6. In the Server Port box, type 587.
7. Click the OK button.
8. Restart Mail.

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Set Outgoing Mail Port to 587 in Incredimail and Other email Applications

Ensure that your email program is set to use outgoing mail (SMTP) port 587. If the port is set to anything else, the email will not be delivered. If you need assistance changing the port, contact the manufacturer of the program.

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About this article:
Last updated: 08-31-2012
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