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FortiGate vs. FortiMail

FortiGate offers a cut-down version of security features in one place, with basic anti-spam capabilities that are flow-based and lack in-depth email inspection. It is limited in its ability to examine attachments and apply sophisticated spam filters.
FortiMail, on the other hand, is a fully-fledged email gateway with advanced security features like content inspection, antivirus scanning, attachment disarming, and quarantining. It provides a comprehensive solution for email security needs.

Pricing for FortiMail is primarily determined by throughput rather than the number of mailboxes. Higher-spec models are required for processing larger volumes of inbound emails.
For smaller use cases where the volume of emails is not high, cloud-based solutions like Mimecast may be more cost-effective. Fortinet also offers FortiMail Cloud as a cloud-based service option.

Users have reported issues with running FortiMail on different platforms such as Hyper-V and ESXi. Technical assistance from TAC support may be required to address and resolve these issues.
Upgrades and version compatibility are essential considerations to ensure smooth operation of FortiMail.
When facing issues, reaching out to technical support and following their recommendations for upgrades can help in resolving certain issues.

Message rate limits are crucial settings that may need to be adjusted based on specific requirements. Users often find themselves tweaking these limits to optimize email flow and prevent bottlenecks.
Referring to documentation like the Microsoft Exchange message rate limits can provide valuable insights into setting appropriate message rate limits.