26 Nov 2020 
Support Center » Knowledgebase » I receive error 0x800CC0F when attempting to send emails via Outlook and/or Outlook Express.
 I receive error 0x800CC0F when attempting to send emails via Outlook and/or Outlook Express.
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Your Internet Service Provider (ISP) may be blocking port 25 traffic to all mail servers other than their own.  This is a common occurrence as ISP's step up efforts to combat spam.  In order to resolve this issue, please modify your SMTP port settings within Outlook or Outlook Express to alternate port 587.



Article Details
Article ID: 210
Created On: 20 Sep 2012 3:01 PM

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