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exchange 2013 not receiving mails

I get a mail failure message when I send a test mail to an account

#< #5.4.6 X-Postfix; mail for mysite.com loops back to myself> #SMTP#

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I've set up an exchange in a win 2012 environment server I can send mail fine, But for some reason I cannot receive mails, and get the above error back

mails are sent to me@mysite.com

I had it working on an earlier installation but unfortunately that one crashed completly

my mail recievers are set up on port 587 as 25 is closed by my isp

any ideas are more than welcome
1 Solution
server config - hub transport the under receive connectors. I always remove any default smtp relay ones and start from scratch for this one. Make a new one, and make sure the fqdn is yourserver.domain.com, then make sure it has port 587 on the next tab and has the correct ip range of servers who can receive in your domain and then on the last security tab check exchange servers for permissions.
whatslifeAuthor Commented:
got it working

just after I wrote this, but had to pick up the kid so didnt have the time to post

but I made the change at my dns provider setting up a mxbackup forward (not sure if all providers offer this but this one does) that send the mails to port 587, and the flood began

(I use gratisdns.dk which is a free service for those interested)

the odd thin though is that I had it working on my first installation without doing this. and I recon your answer is correct valmatic if not completely then almost
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