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In my company we're using Postfix as a relay for Google Apps SMTP server in a Debian server. Legacy machines like scanners forward messages to our relay server.

How can i allow the scanner to only send mails through the relay only to certain domains (e.g. our .com)?

I'm pretty sure there's something here but I haven't found something working.

Thanks.

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How can i allow the scanner to only send mails through the relay ...

Check this --> How to set up an SMTP Relay Server

... only to certain domains

Check this --> Is it possible to limit outgoing emails in Postfix to one specific domain?

  • I need to combine the two suggestions but at the same time allow other machines to relay to everyone. Something like: if (sender==scanner) allow relay only to ourdomain.com else allow relay to everyone – mix Jul 1 '16 at 6:36

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