my outlook has stopped sending emails. They are locked in the outbox. I am receiving emails perfectly normally.

John Bambery 5 Reputation points
2026-04-28T07:57:30.93+00:00

My outlook has stopped sending emails. They are locked in the outbox. I am receiving emails perfectly normally.

Secondly, I can only use Classic Outlook. The last time I spoke to someone at Microsoft he said that there were technical issues which prevented me from using the the new Outlook. Have these technical issues been resolved?

[Moderator note: personal info removed]

Outlook | Windows | Classic Outlook for Windows | For business
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John Bambery 5 Reputation points
2026-04-30T15:17:45.7833333+00:00

Yes, I had a word with a local Computer chap, where I purchased my computer. He suggested deleting the Icloud account and re-installing. So I changed my password on my iPhone and re-installed Outlook Classic. Everything worked perfectly. I then took the trouble to do the same with New Outlook and low and behold that worked to. So I have deleted Classic and am now using New Outlook without any problem. If only someone from Microsoft could have told me this it would have been much easier. Regards John

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  1. Jayden-P 26,280 Reputation points Microsoft External Staff Moderator
    2026-04-28T08:32:26.7033333+00:00

    Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

    Hi John Bambery

    May I ask if you are using Exchange, IMAP or POP account?If you are using Exchange, please log in via https://outlook.cloud.microsoft/mail/ and check if you can send new emails there.

    If you are using IMAP or POP, verify your SMTP port and server name. If possible, can you please provide your provider's name so I can find more information about it.

    You mentioned you spoke with Microsoft Support about using New Outlook? Did he mention what issue in particularly?

    When you log in with New Outlook, does any error message show up? If yes, please provide it.

    Additionally, if you are using a business account, an IT admin of your organization can block users from using New Outlook. Control Installing and Using New Outlook | Microsoft Learn. So please check with your IT admin as well.

    Some of the basic method you can try is:

    • Remove and re-add account.
    • Open Outlook in safe mode - Microsoft Support (If this works, the problem is likely one of the add-ins, you can go to File > Option > Add-ins > Go > Uncheck any suspicious add-ins)
    • Rebuild .ost file: Close Outlook > Press Windows + R > Type in %LOCALAPPDATA%\Microsoft\Outlook\ > Look for your email address and delete it > Restart Outlook. (Applies to Exchange and IMAP accounts only)

    Please provide more information so I can assist you better. I look forward for your reply.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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