HI Everyone,

 I have exchange server 2013 running on windows server 2012 and its internal with 100 user's. I am able to send and receive mail internally within our premises with help of OWA. Now as per our requirement we want to access it externally so that we can access our mails from other branches and also send and receive mail from other domains. It would be great if you please help me with details requirements and procedure for the same. We have our company website hosted by providers so can we use that IP address or else I Need to get an another IP address.

Thanks in advance for your support I know this must be simple for you ppl. I don't want to mess with my current setup experimenting blindfolded.

 

Hello

Have you got any firewall? like TMG ?
so possible publishing OWA, outlook anywhere, EA for user acces to email.
For enable communication to other domain from world need: publish /in-out/smtp port /25/ and in your public domain DNS MX,A record.

NO, we are not using any Firewall at this time.

Hello

If you thinking to open to internet your internal resource need firewall.

Hi,

As additional for Gabor, We must registry DNS MX record and integral A record in external DNS server, for example contoso.com, autodiscover.contoso.com, mail.contoso.com.
Besides, we can modify the internal and external URL for all virtual directory, also configure relevant send and receive connector for external mail flow.
More details about Configure mail flow and client access, Autodiscover Service for Internet Access, for your reference:
https://technet.microsoft.com/en-us/library/jj218640(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/aa995928%28v=exchg.141%29.aspx?f=255&MSPPError=-2147217396

Thanks