howto/EMail.md
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@@ -48,6 +48,29 @@ and add this transport to /etc/postfix/transport for dn42 (and dont forget to po
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This should to the trick for sending mails via your DN42-IP
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+If you use `smtpd_recipient_restrictions` you can use the following rule to white-list dn42 as sender.
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+
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+```
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+smtpd_recipient_restrictions = permit_mynetworks,
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+ permit_sasl_authenticated,
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+ check_client_access cidr:/etc/postfix/dn42.cidr,
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+ reject_non_fqdn_sender,
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+ # ...
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+ permit
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+```
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+
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+```
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+#/etc/postfix/dn42.cidr
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+172.16.0.0/12 OK
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+10.0.0.0/8 OK
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+fc00::/7 OK
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+```
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+
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+```
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+$ postmap /etc/postfix/dn42.cidr
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+```
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+
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+
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### Receiving emails
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The Domain mails should be received for has to be added to `mydestination =` in main.cf