Email Size and Storage Limits
All e-mail accounts provide 5 GB of server side storage for archiving messages. You can send messages up to 25 MB in size.
The maximum size for email messages, including any attachments, is 35 MB; however, when attachments are sent over the Internet, they must be encoded, and this encoding increases the size of the message. The size increase can sometimes be more than 25 percent.
We recommend that you not try to send attachments that are larger than 25 MB. If you want to share large files, we recommend that you use the Files feature that is part of Webmail.
In addition, some mail servers will not accept large email messages, so if you attach a large file to your message, it may not reach its intended recipient.
*Information provided from OpenSRS.