CU's Exchange (Office 365, Outlook) system limits the size of email messages, including their attachments, to 25 MB. CU's e-lists limit full message size to 1MB. |
Messages that exceed the size limits are rejected by Exchange. Note that email rejections can also occur as a result of CIT's efforts to block spam.
Cornell staff considering sending attachments (large or otherwise) have options, including:
What's the biggest attachment I can send?