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I get the following error trying to send an email to my Google Apps Email at admin@mydomain.com from my Postfix server.

to=, relay=local, delay=0.09, delays=0.07/0/0/0.02, dsn=5.1.1, status=bounced (unknown user: "admin")

Is there a way I can force it to not use the LOCAL relay and treat admin@mydomain.com as outside email and not look for a user in the current postfix configuration.

I am trying to email the full email address "admin@mydomain.com" not only "admin".

I have the Google Apps MX record on mydomain.com + SPF record which before was:

v=spf1 include:_spf.google.com ~all (emailing to admin@mydomain.com used to work with that record)

But I had to change it to v=spf1 a mx ip4:MY.IP.HERE include:_spf.google.com ~all

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Yes you can. Don't use admin as the recipient. Use something that is "outside" like admin@mydomain.com.

This only works if mydomain.com is not the domain configured in Postfix. Because Postfix thinks everything is local when you configured it to be local.

You should provide WAY more information than "it doesn't work". What are your configured domains, relay hosts, transport maps, MX records and the like?

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I have only one configured domain "mydomain.com", no other fancy stuff that is not out of the box Postfix. – user40388 Aug 15 '11 at 18:46
And there is the problem. You told "mydomain.com" belongs to Postfix. But then you want that domain to be outside. That does not fit. – mailq Aug 15 '11 at 18:54
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I am a bit confused on the matters related to postfix :) I fixed the issue by not setting the mydestination param in main.cf – user40388 Aug 15 '11 at 19:00
Fine. That is what I proposed. – mailq Aug 15 '11 at 19:04
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Nothing more easy than that! Set it to myhostname = thehost.mydomain.com. That's why it is called myhostname and not mydomainname. – mailq Aug 15 '11 at 19:09
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