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Home > Help & Support > Knowledge Base > Email & Collaboration > Office 365 > Office 365 General > What is the maximum size message and attachment I can send?

What is the maximum size message and attachment I can send?

The maximum size for any single email message including attachments is 25 MB. The mail client (ex. Outlook, Apple Mail etc.) you use to send messages may also impose a limit on the size of any single attachment. For Outlook on the Web, the single attachment limit is 10 MB. For example, a message may have two 10 MB attachments (total = 20 MB), but not a single 15 MB attachment as that would exceed the single attachment limit. This is subject to change.

For the latest information, see this Microsoft article.

Last modified: August 23, 2021

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