GUI item | Description |
Hide this box from the mail server (transparent mode only) | Enable to preserve the IP address or domain name of the SMTP client in: • the SMTP greeting (HELO/EHLO) and in the Received: message headers of email messages • the client IP in email header This masks the existence of the FortiMail unit. Disable to replace the IP addresses or domain names with that of the FortiMail unit. Note: Unless you enabled Take precedence over recipient based policy match in the IP-based policy, the Hide the transparent box option in the protected domain supersedes this option, and may prevent it from applying to incoming email messages. Note: For full transparency, also enable “Hide the transparent box”. |
Restrict the number of connections per client per 30 minutes to | Specify the maximum connections per client IP address in a period of 30 minutes. |
Restrict the number of messages per client per 30 minutes to | Specify the maximum email messages (number of MAIL FROM) a client can send in a period of 30 minutes. |
Restrict the number of recipients per client per 30 minutes to | Specify the maximum recipients (number of RCPT TO) a client can send email to for a period of 30 minutes. |
Maximum concurrent connections for each client | Enter the maximum number of concurrent connections per client. |
Connection idle timeout (seconds) | Enter a limit to the number of seconds a client may be idle before the FortiMail unit drops the connection. |
Do not let client connect to blocklisted SMTP servers (transparent mode only) | Enable to prevent clients from connecting to SMTP servers that have been blocklisted in antispam profiles or, the FortiGuard AntiSpam service if enabled. |