Outlook cannot send an e-mail with an specific attachment.

Terrao, Jorge 1 Reputation point

Hello, Microsoft Team. How are you today?

I am facing an issue that I couldn't solve it.

One user told me about it - when he sends an e-mail with a specific attachment, he receives one returning message:

One or more recipients did not receive your message.

  Subject:  E-mail de teste
  Sent: 17/03/2022 11:07

It's not possible to reach the following recipients:

  Guias, Renato at 17/03/2022 11:07
  Davis, Marcello at 17/03/2022 11:07
        This message could not be sent. Try to send it later or get in touch with the network administrator.

Diagnostic information to administrators:

Error is [0x8007007a-0x00000000-0x00000000].

Failed to load attachments to the server (error 0x8007007a).

Failed to sent message: message ID (1), fail number (29), HResult(0x8007007A), EC(0).

I cannot send you the attachment because it is 15,4MB large, so I won't get to do it so.

The strange is, this attachment was sent by OWA normally, but not by Outlook.

What I've done already:

  • I gave permission to my username to receive ownership to run Outlook as an administrator;
  • I've repaired the Office installation;
  • I've deleted the old profile, creating a new one and re-synchronizing it;
  • I've deactivated, for once, all COM add-ins (reactivating it later);

And none of the procedures performed made Outlook send an e-mail with this attachment.

I hope you can help me to solve this issue.

Kind Regards,

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. ChristyZhang-MSFT 21,256 Reputation points Microsoft Vendor

    Hi @Terrao, Jorge

    Welcome to our forum!

    What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.

    I cannot send you the attachment because it is 15,4MB large, so I won't get to do it so.

    Through my research on the error, it seems to be related to the attachment size. As know, there are different attachment size restrictions for different types of accounts in Outlook 2013 and later versions. What's the type of your account?(Exchange/IMAP/POP)

    Considering that the mail is too large, it is recommended that you could compress the attachment and add the compressed attachment again to send to the recipients to check if there're any differences.

    In addition, considering the impact of the attachment itself, please send another attachment to check if it can be sent successfully.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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