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Hello Community,
This is an issue I hadn’t experienced before. For example, today I sent an external email of 9 MB with 3 attachments, but the recipient, who is on my Exchange Server 2019 (up-to-date), only received 2 attachments. When I resent the email, they were able to receive it without any problems.
This is also happening with other users in my organization, and they have reported it to me. I’ve checked and found no restrictions, and it’s not related to message size either. I tried replicating the issue, but it no longer occurs. This is concerning because the user who reported the issue today is a VIP.
I had an Endpoint AntiSpam enabled, which I have already deactivated, and I also have a WatchGuard firewall. I need to determine if the problem is related to this, as an initial review indicated that everything was fine.
Has anyone else experienced this issue?
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Hello, @Celso Javier Guzmán Díaz，
Just checking in to see if information below was helpful.
If the issue has been resolved, please mark the helpful replies as answers.
Best Wishes,
Alex Zhang
Hello, @Celso Javier Guzmán Díaz,
If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
Best Wishes,
Alex Zhang
Hello, @Celso Javier Guzmán Díaz,
Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.
Best Wishes,
Alex Zhang
Hello, @Celso Javier Guzmán Díaz,
If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
Best Wishes,
Alex Zhang
Im leaning towards AV when I hear this. When was the anti spam disabled?
Hello, @Celso Javier Guzmán Díaz,
Welcome to the Microsoft Q&A platform!
Andy David - MVP has given a reasonable assumption. Antivirus (AV) software can sometimes interfere with email attachments, especially if it detects them as potentially harmful or if there's a configuration issue.
To address this, you can:
1.Temporarily Disable Email Scanning
2.Review AV Logs
3.Update AV Software
4.Whitelist Attachments
5.Check the quarantine and email scan settings
Moreover, an article about not being able to display email attachments is provided for your reference: Outlook Not Showing Attachments? 8 Ways to Fix.
(Please note: Microsoft provides third-party contact information to help you find additional information about this topic. This contact information may change without notice. Microsoft does not guarantee the accuracy of third-party contact information.)
Should you need more help on this, you can feel free to post back.
If the answer is helpful, please click on “Accept answer” as it could help other members of the Microsoft Q&A community who have similar questions and are looking for solutions.
Thank you for your support and understanding.
Best Wishes,
Alex Zhang
Hello, @Celso Javier Guzmán Díaz
If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
Best Wishes,
Alex Zhang