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Konstantinos Tsoukalas

Konstantinos is the founder and administrator of Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).


  1. Gary L
    May 22, 2022 @ 3:29 pm

    What about if I have only received one lone failure message (that I did not send).
    Something to worry about or system glitch?
    Details below, do let me know!

    from: Mail Delivery Subsystem
    to: "My Correct E-Mail" addy
    date: 16 May 2022, 18:24
    subject: Delivery Status Notification (Failure)
    Signed by:
    security: Standard encryption (TLS) Learn more
    : Important according to Google magic.


    • lakonst
      May 24, 2022 @ 11:27 am

      No, it's just a spam message.


  2. Ben-Zion Joselson
    October 3, 2020 @ 12:12 pm

    I have noticed that legitimate informative messages from Mail Delivery Subsystem, regarding failure to deliver my email to a recipient, are only displayed in my gmail website on the Internet, but they are completely ignored by Outlook 2010 mail client that I use for sending and receiving gmail at home.
    These messages do not appear in Inbox nor in Junk E-mail in Outlook 2010.


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