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Can't send email in Outlook 2010, "421" error

    Question

  • I just loaded Office 2010 on my Win 7 32-bit laptop and i can't send emails in Outlook 2010.

    I get the "421 cannot connect to SMT" error.

    I was on the phone with my ISP for an hour verifying all the settings are correct, but no luck.

    I was using Outlook 2003 with no problems. Any Ideas? I can recieved emails just fine.

    Tuesday, October 26, 2010 12:31 AM

Answers

  • You can start a Telnet session by using the Telnet command,

    Please visit http://support.microsoft.com/kb/153119 and follow the steps.

    Regards,


    MCITP: Enterprise Administrator |MCITP: Server Administrator MCITP: Enterprise Suppport | MCTS: Exchange 2007, 2010, OCS2007 | UC Specilized
    • Proposed as answer by Khalidra Wednesday, October 27, 2010 6:53 AM
    • Marked as answer by Sally Tang Thursday, November 04, 2010 8:35 AM
    Wednesday, October 27, 2010 6:53 AM

All replies

  • My friend I think it is a port blocking issue. Please verify that port 25 is not blocked. Furthermore, if it did not work try using another port. That is my suggestion for now. Let me know if it did not work.

    Regards,


    MCITP: Enterprise Administrator |MCITP: Server Administrator MCITP: Enterprise Suppport | MCTS: Exchange 2007, 2010, OCS2007 | UC Specilized
    • Proposed as answer by Khalidra Tuesday, October 26, 2010 6:16 AM
    Tuesday, October 26, 2010 6:16 AM
  • Hi Khalida, thanks for answering. I have a dumb question, how do I verify if port 25 is blocked or not?

    thanks

    Wednesday, October 27, 2010 3:53 AM
  • You can start a Telnet session by using the Telnet command,

    Please visit http://support.microsoft.com/kb/153119 and follow the steps.

    Regards,


    MCITP: Enterprise Administrator |MCITP: Server Administrator MCITP: Enterprise Suppport | MCTS: Exchange 2007, 2010, OCS2007 | UC Specilized
    • Proposed as answer by Khalidra Wednesday, October 27, 2010 6:53 AM
    • Marked as answer by Sally Tang Thursday, November 04, 2010 8:35 AM
    Wednesday, October 27, 2010 6:53 AM
  • Hi Khalida,

    Thank you very much, it worked

    Friday, November 05, 2010 2:31 AM
  • Can someone guide? i cant seems to follow the steps. i am really confuse. i used to be able to send email from the outlook but now i cant anymore.

    provide with answer please

    i use different port but i cant seems to connect.

    used to be able to

    Tuesday, April 10, 2012 4:05 AM