Exchange 2013 + External User

Here is my Scenario,

I have  an internal Windows 2012 server With Exchange 2013 installed,  an  external  Hoster for our dns  web and mail.  I have installed a third party Exchange pop3 connector who connect to our external hoster to dispatch mails in specific mailboxes, everything works fine but the boss don't want his mails  to go to our exchange server, he wants only imap connexion to our external hoster,  the problem comes when we try to send e-mails to the boss  from internal domain, he's not receiving them to the external host. So how can i proceed to have a clean solution ?
Thank you in advance

Patrick
pragmatickAsked:
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Simon Butler (Sembee)ConsultantCommented:
Why are you using an external host with Exchange? POP3 connectors are awful things, and should be banished. If you used Exchange as it was designed, with all email coming to Exchange, then it wouldn't have any problems. If you think the external host will be more reliable, then think again. Most web hosts will be running their email service on some complete junk hardware.

To answer your specific question, the reason it doesn't work is because Exchange expects to be responsible for all email for the domain. You are sharing the SMTP address space with another server, so have to configure it to do so.
This is a guide for Exchange 2010.
https://technet.microsoft.com/en-us/library/bb676395(v=exchg.141).aspx
It is pretty much identical to Exchange 2013 (there is no equivalent 2013 article).

However I stress again, the best option is to have all email delivered to the Exchange server. I have never been given a reason for using a POP3 connector that doesn't have a solution allowing Exchange to be used as designed. I wrote this nine years ago - still valid:
http://blog.sembee.co.uk/post/Why-you-shouldnt-use-a-POP3-Connector.aspx

Simon.
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pragmatickAuthor Commented:
thanks
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