What is the biggest attachment I can send or receive?
The maximum size of a message, including any attachments, is 50 MB (megabytes). Encoding the attachment (making it part of the message) adds to its size, so if a file is almost 50 MB, it may be too large when encoded. If you need to share files larger than 50 MB, you can use Cornell’s DropBox service. This is also a university-approved, secure way to transfer confidential or sensitive data.