Trying to email a 45MB video to a client and Outlook blocks it with The file you are attaching is bigger than the server allows.
Office 365 account on Outlook 2016. Is there a setting to raise the limit or do I need another route?
Cannot send large size attachment in Outlook: file exceeds limit
Solved Email & Outlook
BA
Barry Allen August 27, 2019
2 replies
11,150 views
Reviewed by moderators
There are two limits stacked on top of each other. Outlook has a client side default of 20MB and your mail server has its own cap. Exchange Online allows up to 150MB but only if both the client limit and the tenant setting permit it.
You can raise the client limit in the registry. Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences, create a DWORD named MaximumAttachmentSize and set it to the size in KB, for example 51200 for 50MB. Restart Outlook.
Even then the recipient side can bounce it. Most corporate servers reject anything over 25MB regardless of what you can send. For a 45MB video the reliable route is a share link: upload to OneDrive, right click, Share, paste the link in the mail. The client gets a fast download and you avoid every size cap in the chain.
Went with the OneDrive link since the client is on a strict corporate server. Delivered fine. Good point about the recipient side limit.