mail flow

I have below set up of exchange server 2010(sp3)
MBX server -3
CAS/HUB-2
Edge-2
DC-1, ADC-2
What are all the settings that I need to make to send/receive mails from internet?
I have registered my domain as well.
Any article about how mails will flow and all the settings I need to do.
I also don’t want that my mails will go to spam of other’ s domain
Please suggets
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Manish KumarSr. Technical ConsultantAsked:
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Andy MConnect With a Mentor Internal Systems ManagerCommented:
Firstly you will need to create receive connectors on your HUB and Edge transport servers to accept email (though if I remember correctly Exchange should have already done this). You also need to add the accepted domain to exchange and setup mailboxes, recipient policies, etc.

This link gives a run through of the basics: http://www.enterprisenetworkingplanet.com/windows/article.php/52231_3877601_2/Installing-Exchange-2010-StepbyStep.htm

You also need to open and forward port 25 on your firewall to your hub/edge transport server. At this stage you can test this using telnet. (https://technet.microsoft.com/en-us/library/aa995718%28v=exchg.65%29.aspx). You may also need to open/forward port 443 to allow users to connect via OWA, Activesync and Outlook Anywhere (this will need to go to the CAS server).

Once you are happy that is working setup your MX records on your external domain records to point to your server's external IP address. (This may take time to propagate so won't work straight away).

At this point you should have mail flow working correctly.  

There's some other configuration you can do to help reduce the possibility of your email system been seen as spam:

1. Lock down port 25 on the network so only the Exchange servers can send out on it. (This prevent viruses on networked computers spamming emails out on 25)
2. Setup a reverse dns entry on your internet line to match the hostname on your MX record. You'll need to contact your ISP to do this.
3. Setup an SPF record. (https://www.123-reg.co.uk/support/answers/Domains-Archive/Domain-Configuration/how-do-i-add-an-spf-record-to-my-domain-name-349/)
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