Please see Google's Gmail sending limits in Google Workspace help page for their default limits. Below, we've noted changes or additional limits managed by Cornell.

Message Size

The maximum size of a Google Workspace message is 25 MB, including all attachments. Please note that the process of adding a file to a message increases its size (by adding encoding necessary for transmission), so if your file is almost 25 MB, you may get a "too big" error message.

For larger files, use your Cornell Box account, or an external service like Google Drive.

Attachment Types

Google does not permit sending or receiving executable files (such as files with names that end in ".exe"). This includes executables that have been compressed (zipped) into files such as .zip, .tar, and .tgz.

Number of Recipients

Using Google Workspace's native (web-based) interface, the maximum number of recipients for one message is 500.

Using Google Workspace through an email client, the maximum number of recipients for one message is 100.

If in a 24-hour period, you send messages to more than 300 external recipients (that's 300 combined over however many messages you send in that period), we will block your account for suspicious activity, and you will not be able to send or receive mail until you contact the IT Service Desk. Be aware that Cornell email addresses that are set up to forward to external addresses count towards this limit.

There is no limitation to the number of Cornell addresses (that do not forward externally) you send to in a 24-hour period.