Block attaching documents

Question

Is there a way to disable attachments while sending documents in Outlook, both desktop and online, and only allow links to be sent?

Answer 1

Hi @Laxson Paradza ,

Is there a way to disable attachments while sending documents in Outlook, both desktop and online, and only allow links to be sent?

You can create a mail flow rule similar like blow to block mails with attachments from being sent:

Tick "Stop processing more rules" after clicking Next:

From the Exchange admin center, we can only set the attachment size limit to "1KB", to block smaller attachments as well, we'll need to connect to Exchange Online PowerShell and run the command below:

Set-TransportRule -Identity <RuleName> -AttachmentSizeOver 1B

I tried testing in my lab tenant and below is the NDR I received when attempting to send out a mail with an attachment(1byte):

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