Description
This article describes how to configure the maximum email message size limit.
Scope
FortiMail.
Solution
The maximum email size that the FortiMail can relay is configurable between 1 and 204,800 kilobytes. This option cannot be set to 0 (disabled).
The maximum size of the message is set in Profile -> Session, under SMTP Limits (Cap message size (KB)). Then this session profile needs to be applied to an IP Policy to take effect (double-check if the particular email matches the IP policy with the applied session profile).
There is also a domain setting for the message limit under Domain & Users -> Domain, choose the domain, expand 'Advanced Setting' -> Other, and update 'Maximum message size (KB)'.
- For outgoing emails, only the size limit in the session profile will be matched. If there is no session profile defined or no IP-based policy matched, the default size limit of 10 MB will be used.
- For incoming emails, the size limits in both the session profile and domain settings will be checked. If there is no session profile defined or no IP-based policy matched, the default size limit of 10 MB will be compared with the size limit in the domain settings. FortiMail will use the smaller size.
