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achimdet's avatar
achimdet
Copper Contributor
Jul 30, 2025

Outlook emails not sending (Error code: 0x80070005-0x000004dc-0x00000524)

I am going out of my mind and NEED HELP. PLEASE!  :) A few days ago, my personal Hotmail account (no company Exchange etc) started to bounce back emails I send from or reply to from my Outlook clien...
office 365
outlook for windows
LisaHendrickson's avatar
LisaHendrickson
MVP
Jul 31, 2025

I'm thinking the auto-complete for those entries are bad/corrupted. If you are sending to a lot of people, one of them is causing this. The easy fix is to click on the X on their name when you type it and add in in manually again. 

  • achimdet's avatar
    achimdet
    Copper Contributor
    Aug 02, 2025

    Hi Lisa!  Thank you for the idea!   Unfortunately, that is not it either.  It happens when sending to individuals, groups, even myself.  I have tried the removing of auto-complete options and it does not change the issue. :(

    • LisaHendrickson's avatar
      LisaHendrickson
      MVP
      Aug 05, 2025

      How many people are you sending this email to at one time? There are limits, so maybe that's one of the issues. 

      • achimdet's avatar
        achimdet
        Copper Contributor
        Aug 06, 2025

        Thank you for the additional tip. Unfortunately, that's not it either though.  It happens when just sending to one person (incl. myself), as well as with any other number of people on the email. :(

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