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Introduction to a Self Managed Life: a 13 hour & 28 minute presentation by FUTO software
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=== Rule 2: Forwarding SMTPS (Port 465) === * '''Protocol''': IPv4 TCP * '''Source''': <code>mailserver_trusted_clients</code> * '''Destination''': 192.168.5.3 * '''Port''': 465 (SMTP/S) * '''Description''': NAT Forward Postfix SMTPS to Mailcow <blockquote>'''What this rule does''': - This rule allows secure SMTP (SMTPS) traffic on port 465 from the clients defined in the <code>mailserver_trusted_clients</code> alias to be forwarded to the Mailcow server running on 192.168.5.3. For instance, if you are integrating self-hosted-email with a service like [https://support.freshdesk.com/support/solutions/articles/195170-using-custom-email-servers-to-set-up-support-emails freshdesk], you would want to open this port so their app can send emails using your server. However, you would not want to open it to the entire world, just for the clients you want. In the case of freshdesk, you might make a <code>mailserver_trusted_clients</code> alias with all of [https://support.freshdesk.com/support/solutions/articles/50000005619-allowlist-nat-ips freshdesk’s IP addresses] so they make it through on port 465, but nobody else does. - SMTP (Simple Mail Transfer Protocol) is the protocol used for sending emails. The S at the end of SMTPS indicates that this is a secure version of SMTP, meaning the communication is encrypted using SSL/TLS. - '''When this is needed''': This rule allows email clients that are NOT connected to your server via VPN to send emails using encryption. If this port is closed, they will not be able to connect to your mail server to send mail. - '''When this NOT needed''': This rule is unnecessary if you are sending mail by connecting to your mailserver via VPN, or locally on your home network. It is unnecessary if you do not have external services such as freshdesk that you integrate with your mailserver. </blockquote> <span id="rule-3-forwarding-submission-port-587"></span>
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