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CITCU's Exchange (Office 365, Outlook) system limits the size of email messages, including their attachments, to 25 MB. The size limit is required with Office 365CU's e-lists limit full message size to 1MB. |
Messages that exceed the size limits are rejected by Exchange. Note that email rejections can also occur as a result of CIT's efforts to block spam.
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Here is the specific answer if using CIT's email.
Limited information specific to the limits related to CIT's e-list service
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- lyris/send-large-files-e-list-messages
- As of 1/27/17: E-list messages have a maximum size of one megabyte, including attachments. It helps to know that the very act of attaching a file to a message increases its size, so if your attached file is over, say, 700K, it's going to be too big.