Email, Size limits on email

This page describes the size limits for campus email messages

The "total' message size limit for email messages include: the email header, attachments and message body.  The limits are:  

Method
Size Limit
Technical Notes
 Exchange-to-Exchange 100 MB
 Emails sent between 2 Exchange accounts using Exchange-native protocols, such as Outlook Web App and Outlook desktop client
 Exchange ActiveSync
10 MB
 Emails sent from mobile devices, such as iOS and Android devices, using Exchange ActiveSync
 Campus relays
65 MB
 While email sent through the campus mail relays, such as Google Apps @ Illinois, Exchange mail accessed from an IMAP client, Express-SMTP, and smtp.illinois.edu can be as large as 65MB, the email may be rejected due to 3rd Party Email Provider limits.  For example:
  • gmail - 25MB
  • outlook.com/hotmail - 10MB
  • yahoo - 25MB
  • AOL - 25MB
 Campus mailing lists
10 MB*
*Default setting.  See Campus Mailing Lists, How to send attachments to a list for information on sharing documents.





Keywords:email, size limit, relays, Exchange, Google Apps, express-smtp, express, smtp   Doc ID:57611
Owner:Email Relays E.Group:University of Illinois Technology Services
Created:2015-10-20 09:32 CDTUpdated:2017-09-11 09:53 CDT
Sites:University of Illinois Technology Services
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