Outlook 2010 and later have a built-in warning system for attachments that are too big to be sent. Outlook 2010’s, Outlook 2013’s and Outlook 2016’s attachment limit When you try to send a message that is too large for your mail server, you could also get a NDR back but the message could also get stuck in the Outbox and you’ll start getting Send/Receive Errors.įor Outlook 2007 and previous, you can prevent yourself from sending messages with attachments that are too large by using this this workaround. The text within this message will tell you more about why it bounced. This message is also known as a Non Delivery Report or NDR. When the message is too big for the recipient, you usually get a bounce message in return.

Outlook 2007 and previousīasically any error or notification that you are getting in Outlook 2007 and previous about the message file size is either coming from the mail server you are using or the mail server of the recipient of the message.

Outlook might not actually be checking with the server for the limit at all. However, when you are using Outlook with a POP3 or IMAP account, Outlook could also nag about exceeding the allowable limit set by the server, even though you didn’t.īy setting a Registry value, you configure when Outlook starts reminding you about the total message size or disable the nag screen completely. The attachment size limit, or actually message size limit as it includes all your attachments and the message itself, is determined by the sending size limit configuration of the mail server that you are using. How can I increase the attachment size limit? It has occurred on Windows 10, 8.1, and 7.When I try to send a message with some attachments, I get the warning that my message is too big to be sent. On others the issue still occurs in safe mode. On some of the affected machines safe mode will allow it to open (and then I tried eliminating all add-ons) but still have the issue. I have tried updating Acrobat Reader, Windows, and Office 365 all to their most recent versions, as well as completely uninstalling and reinstalling all of the applications (save for windows.) I've even created a new outlook profile for the users experiencing the issue but it's still happening. I have to manually close out of Outlook through Task Manager. They are all using Office365 (which would be Outlook 2016.) When they view an email in the preview pane (or open the email in its own window) as soon as you click on the attached PDF file outlook turns white and freezes.

I'm an IT professional, and I've noticed in the last few days that several clients in different environments on different versions of windows are having this issue.

Nuance outlook cannot attach file