If your ISP does not allow you to send out mail with any other
mail server except for their own

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Your ISP is your internet service provider.  It is the company who provides your connection to the internet.

Sometimes ISPs will not let you use your domain mail server for your outgoing email settings in Microsoft Outlook.  They may require you to setup your pop account using their outgoing mail server instead of your domain name pop account outgoing mail server.   If this is the case, you may receive errors when trying to send email through Outlook.  When this happens, you can usually receive email sent to your domain name pop account, but your are unable to send email out using your domain name pop account.

If you are experiencing such a problem, please do the following:

  1. Get with your ISP support and ask them what their OUTGOING SMTP SERVER IS. It will be something like mail.comcast.net. (Comcast requires that you use their outgoing server to send any mail from their connection).  Replace their response in your Outlook configurations, by opening Outlook, Select TOOLS, EMAIL ACCOUNTS, VIEW OR CHANGE EXISTING EMAIL ACCOUNTS, then click NEXT. Select the problem pop account and hit the CHANGE button on your right.
  2. Then, type in what your ISP says where indicated in the image below. Then hit the NEXT button, then the FINISH button. Then close Outlook and reboot your computer. Get back online and test popping your email account. 

  3. If the above doesn't work, go back into your pop account configurations, and press the MORE SETTINGS button. Be sure that you pop your incoming email before you SMTP out.

    POP means to get mail in
    SMTP means to send mail out