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In MTA mode, Sophos Firewall routes emails between your mail servers and the internet. When you turn on MTA mode, a firewall rule is created automatically to allow SMTP/SMTPS traffic. We recommend that you keep this rule at the top of the firewall rule table.

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Under SMTP settings, for SMTP hostname, enter your domain name (example: organization.com). Don't enter your mail server's hostname. The firewall uses the SMTP hostname in HELO and SMTP banner strings.

You allow Sophos Firewall to relay SMTP traffic. You create an SMTP route and scan policy to forward emails to the internal mail servers. This example uses mail servers with static IP addresses in the DMZ. You also specify the basic security settings. 041b061a72