Sent emails not received

jean jordan 0 Reputation points
2026-09-10T22:45:39.48+00:00

I send an email to a correct address and it appears in the SENT box but does not arrive at the recipient

Please help me fix this problem

Outlook | Web | Outlook.com | Email
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  1. Jhun Buala 5,535 Reputation points Independent Advisor
    2026-09-11T00:27:26.24+00:00

    Hi Jean,

    Good day. The problem is general. Let's check first whether Outlook is showing any delivery error or bounce-back message. An email can appear in Sent even when the recipient's mail server later rejects or blocks it.

    1. Send a short test email to a different email address, if possible. You can create a new email for testing.
    2. Check the recipient to check its Junk or Spam folder and any blocked-sender settings.
    3. In Outlook, check your Inbox for a message such as "Delivery has failed", "Undeliverable", or "Mail Delivery Subsystem." If you find one, the error message usually tells us what is preventing delivery.
    4. If there is no bounce-back and the test email also isn't received, try sending the same message from Outlook on the web. This helps determine whether the issue is with the Outlook app or with the account itself.

    If the message sends successfully from Outlook on the web but not from the Outlook app, we can focus on the Outlook application. If it fails from both, the account or recipient's mail server may need to be checked.

    Regards,
    Jhun

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  2. AI answer

    2026-09-10T22:45:54.0133333+00:00

    If the message is in Sent, it was sent from Outlook, but delivery can still fail or be filtered after that. Try these checks in order:

    1. Confirm the recipient address again Even a small typo, outdated address, or changed domain can prevent delivery.
    2. Check whether the recipient’s mailbox is full or unavailable If their mailbox is full, they may not receive new mail until they clear space.
    3. Wait and resend once Some errors are temporary, such as connection timeouts, remote server issues, or temporary resource problems.
    4. Reduce message size In Outlook.com, messages with attachments larger than 25 MB cannot be sent. If the message is large, upload the file to OneDrive and send a link instead.
    5. Remove the email signature and resend A signature can sometimes affect sending in Outlook.com.
    6. Try sending from Outlook.com in the browser If the message was sent from Outlook or another email app, try sending the same message directly from Outlook.com.
    7. Ask the recipient to check spam, quarantine, or mail filtering on their side If there is no delivery failure message and the address is correct, the message may be blocked, quarantined, redirected, or treated as spam by the recipient’s mail system. If the recipient uses a work or school account, their IT administrator can check message trace and mail flow filtering.
    8. If only some recipients in a group do not receive it Review the addresses shown in the error report and remove old or invalid addresses from the group.
    9. If Outlook.com shows a non-delivery receipt even though the address is correct Use Sender Support in Outlook.com.

    If the issue happens only with one specific recipient or organization, the most likely cause is filtering or blocking on the recipient side.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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