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In an on-premises Exchange Server, maximum email size limits are configured in several places (at the server, mailbox, and connector levels). Securely send and receive large files via email with Mimecast Large File Send. LIMIT TYPE Outlook (Windows) (OWA) Outlook (Mac) Message send/receive size limit (including attachments) - Keep in mind that someones mailbox on the Office 365 server will be prohibited from receiving messages if they exceed their maximum quota limit. The following table contains the maximum attachment size limits for most popular email services: Mail serviceĪttachment Size Limit in Exchange and Microsoft 365 But most public email providers don’t accept emails larger than 25 MB. If you send large emails only within your organization (local network), you can set any attachment size in Outlook.
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