howto/EMail.md
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@@ -49,6 +49,7 @@ 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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+This can circumvent certain rdns configuration failure or in case you use rbl lists:
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```
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smtpd_recipient_restrictions = permit_mynetworks,