Size Limit for Email Messages


Yes. You can send and receive messages up to 25 megabytes (MB) in size, including the message's text, headers, and any attachments within the University of Alaska's mail system.

However, this is not guaranteed to work with every email address you may use. In theory, there's no limit to the amount of data you can send in an email as Email standards don't specify any sort of size limit. In practice, most email servers, and some email clients, enforce their own size limits. Some servers are configured to not accept email messages with total attachment size of more than 10 MB. Furthermore, since emails often travel over several mail servers when they're sent, you may have your attachment rejected by a server along the way if you attach too much data. Finally, you should keep in mind that email attachments are generally MIME encoded, which increases their size by approximately 33%. So 10 MB of files on your computer will become about 13 MB of data when attached to an email.


Email Provider Message Size Limits
Vendor Message Size Limit*
Apple - iCloud 20 MB
Google - Gmail 25 MB
Microsoft - Exchange Online 150 MB
Microsoft - 34 MB
Yahoo Mail 25 MB

* Message Size limit applies to the message text, headers, and any attachments. Information retrieved from vendor's support documentation July, 2020.


Need additional help or have issues

For support, requests may be submitted anytime by Requesting Support for the Email service. Support Requests are worked by Priority based on the Impact and Urgency of need as well as the order they are received by the IT Employees with the knowledge and permissions to assist with the request.

For immediate assistance please review the Contact IT page for ways to contact the appropriate support group.

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Article ID: 237
Tue 7/21/20 9:21 AM
Wed 7/27/22 9:39 AM