Fix An unknown error has occurred SMTP Error 0x800CCC0B

If you are getting 0x800ccc0b error while sending an email then you should first check the server configuration info in MS-Outlook. In this case of error, generally user not able to send the email because the 0x800ccc0b error in Outlook generally occurs due to wrong SMTP server settings. You may experience when you receive or send an email message in Outlook. This guide will show you how to fix an unknown error has occurred SMTP Error 0x800CCC0B.

RECOMMENDED: Fix this issue in 3 simple steps. Takes only 2 minutes.
1) Download repair utility.
2) Install program and click Scan button.
3) Click Fix Errors button when scan is completed.
4) Restart your computer.

  • Error Message: An unknown error has occurred. Account: ‘ email@yourdomain.com’, Server: ‘mail.yourdomain.com’, Protocol: SMTP, Port: 25, Secure (SSL): No, Error Number: 0x800CCC0B
  • Task ‘machine.domain.xom – Sending and Receiving’ reported error (0x800CCC0B): ‘Unknown Error 0x800CCC0B’

Warning : Before making any changes in your computer, I suggest you to create a System Restore point  so that you can restore back your computer to previous working stat if something goes wrong. 

Fix An unknown error has occurred SMTP Error 0x800CCC0B

Step 1: Make sure that your Outlook email account settings are correct.

  1. Click on the “Account Settings” under the “Tools” menu.

Fix An unknown error has occurred SMTP Error 0x800CCC0B2. Click on the “Email” and make a double click on the email address by which you are not able to send emails.

Fix An unknown error has occurred SMTP Error 0x800CCC0B3. Through double click other pop-up window will appear, now click on “More Settings buttons.

Fix An unknown error has occurred SMTP Error 0x800CCC0B4. Go to the Outgoing Server tab and select the “My outgoing server (SMTP) requires authentication” checkbox.

Fix An unknown error has occurred SMTP Error 0x800CCC0B

Quick Info : Go through the below link to check email account settings in outlook

We have listed some major Internet Service Providers settings (for manual configuration of Outlook)

We recommend that you contact your Internet service provider (ISP) for information about the exact incoming and outgoing mail server names and settings that you should use when you configure your Internet email account in Outlook. The list provided here contains information only for few Internet service providers in the United States and may not be up to date.

Incoming Mail (POP3) server names and settings:

Provider Name Server Name Port SPA SSL AuthRequird
AOL pop.aol 110 OFF OFF ON
AT&T Yahoo pop.att.yahoo.com 995 OFF ON ON
Charter pop.charter.net 110 OFF OFF ON
Comcast mail.comcast.net 995 OFF ON ON
Cox pop.[insert region].cox.net 110 OFF OFF OFF
Gmail pop.gmail.com 995 OFF ON ON
Juno pop.juno.com 110 OFF OFF OFF
Microsoft Live pop3.live.com 995 OFF ON ON
Netscape pop.3.isp.netscape.com 110 OFF OFF ON
Netzero pop.netzero.com 110 OFF OFF ON
Pacbell pop.att.yahoo.com 995 OFF ON ON
PeoplePC pop.peoplepc.com 110 OFF OFF ON
Qwest pop.[enter state ID].qwest.net 110 OFF OFF OFF
Rogers pop.broadband.rogers.com 110 OFF OFF ON
SBCGlobal pop.att.yahoo.com 995 OFF ON ON
Swbell pop.att.yahoo.com 995 OFF ON ON
Verizon incoming.verizon.net 110 OFF OFF ON
Yahoo pop.mail.yahoo.com 110 OFF OFF OFF

Outgoing Mail (SMTP) server names and settings:

Provider Name Server Name Port SPA AuthRequired Encryption
AOL smtp.aol.com 587 OFF ON None
AT&T Yahoo smtp.att.yahoo.com 465 OFF ON SSL
Charter smtp.charter.net 25 OFF ON None
Comcast smtp.comcast.net 587 OFF ON TLS
Cox smtp.[insert region].cox.net 25 OFF OFF None
Gmail smtp.gmail.com 587 OFF ON TLS
Juno authsmtp.juno.com 587 OFF OFF None
Microsoft Live smtp.live.com 587 OFF ON TLS
Netscape smtp.isp.netscape.com 25 OFF OFF None
Netzero authsmtp.netzero.com 25 OFF ON None
Pacbell smtp.att.yahoo.com 465 OFF ON SSL
PeoplePC smtpauth.peoplepc.com 587 OFF ON None
Qwest pop.[enter state ID].qwest.net 25 OFF OFF None
Rogers smtp.broadband.rogers.com 587 OFF ON None
SBCGlobal smtp.att.yahoo.com 465 OFF ON SSL
Swbell smtp.att.yahoo.com 465 OFF ON SSL
Verizon outgoing.verizon.net 25 OFF ON None
Yahoo smtp.mail.yahoo.com 25 OFF OFF None

Step 2: Check your antivirus manufacturer’s website for additional suggestions or Disable the antivirus software. And Disable the firewall in router.

If you found outlook is working fine after disable the antivirus software, highly recommended to uninstall the same using their removal tool and reinstall it.

List of manual antivirus uninstallers

    1. Click the link associated with the antivirus software currently installed on your system and follow the prompts or instructions on the website.
    2. Once uninstallation is complete, you will need to restart your computer.

A

Avast http://www.avast.com/uninstall-utility
AVG http://www.avg.com/us-en/utilities
Avira http://www.avira.com/en/support-for-free-knowledgebase-detail/kbid/88

B

BitDefender http://kb.bitdefender.com/site/article/333/
BullGuard http://www.bullguard.com/support/product-guides/bullguard-internet-security-guides-12/getting-started/uninstalling-bullguard.aspx

C

CA Antivirus see Total Defense Anti-Virus
Comodo Internet Security https://support.comodo.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=298
CounterSpy http://www.google.com/#q=counterspy+uninstall
Cyber Defender Early Detection Center http://www.ustechsupport.com/faq.html#q4

D

Dr. Web https://support.drweb.com/support_wizard/?lng=en
(Only registered Dr. Web users can access support content)

E

eScan http://www.microworldsystems.com/download/tools/esremove.exe
ESET http://kb.eset.com/esetkb/index?page=content&id=SOLN2788

F

FRISK F-PROT Antivirus for Windows http://www.f-prot.com/support/windows/fpwin_faq/25.html
F-Secure ftp://ftp.f-secure.com/support/tools/uitool/UninstallationTool.zip
http://community.f-secure.com/t5/Security-for-PC/How-do-I-uninstall-the-product/ta-p/15384

G

G Data https://www.gdatasoftware.co.uk/?eID=PushFile&dl=f4b2f2fd23%3AAFEIBgU%3D

K

Kaspersky http://support.kaspersky.com/common/service.aspx?el=1464
K7 Total Security http://www.k7computing.com/en/tools/K7RT.exe

L

LavaSoft http://www.lavasoftsupport.com/index.php?showtopic=28

M

Malwarebytes http://www.malwarebytes.org/mbam-clean.exe
McAfee http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe
Microsoft Security Essentials http://support.microsoft.com/kb/2435760

N

Norman Virus Control/Norman Security Suite http://www.norman.com/support/support_issue_archive/67798/en
Norton (Symantec) ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe
Norton Security Scan ftp://ftp.symantec.com/public/english_us_canada/removal_tools/NSSRT.exe

P

Panda http://www.pandasecurity.com/resources/sop/UNINSTALLER_08.exe
Panda Cloud Internet Protection http://www.pandasecurity.com/resources/sop/Cloud_AV_Uninstaller.exe
Pareto Logic http://www.paretologic.com/resources/help/xoftspyse/195.htm

S

Sophos http://www.sophos.com/support/knowledgebase/article/11019.html
Spybot Search & Destroy http://www.safer-networking.org/faq/how-to-uninstall-2/

T

Total Defense Anti-Virus (formerly CA Anti-Virus)  http://totaldefense.iyogi.com/?p=368
Trend Micro http://esupport.trendmicro.com/solution/en-us/1056551.aspx
Trend Micro Titanium http://esupport.trendmicro.com/solution/en-us/1059018.aspx
Trend Micro Worry-Free Business Security Agent http://esupport.trendmicro.com/solution/en-us/1057237.aspx

V

Vipre (Sunbelt Software) http://kb.threattracksecurity.com/articles/SkyNet_Article/How-to-Uninstall-VIPRE-Antivirus-and-VIPRE-Internet-Security

W

Webroot http://www.webroot.com/prodCheck/?pc=64150&origrc=1&oc=221&mjv=7&mnv=0&rel=6&bld=38&lang=en&loc=AUS&kc=ppc%60lkik^^afhgpewgfa&opi=2&omj=6&omn=1&osl=en&errid
Windows Defender http://kb.eset.com/esetkb/index?page=content&id=SOLN2390
Windows Live OneCare http://download.microsoft.com/download/4/c/b/4cb845e7-1076-437b-852a-7842a8ab13c8/OneCareCleanUp.exe
Windows Security Essentials http://support.microsoft.com/kb/2435760

Z

Zone Alarm http://download.zonealarm.com/bin/free/support/download/clean.exe

Conclusion:

If above steps did not help you to resolve the issues, you may have to create new outlook profile and reconfigure email settings, try creating new Windows user account as well. Hope this will help you to fix the issues. Or you have to contact your ISP for further assistance. For further support, leave comments or ask more on Forum.

Arun Prabhakar has written 159 articles

Arun Prabhakar immensely interested in following Windows and other technology developments. Being passionate Windows blogger, he loves to help others on fixing their computer issues.