MS Exchange 2016 isn't receiving incoming e-mail...

I recently installed Exchange 2016 Standard on a clean Windows 2012 R2 VM install.  
1st:  Installed Win 2012 R2
2. Installed all applicable Win updates
3. Installed the AD Role
4. Promoted to a DC (corp.domain.com) and created necessary user accounts
5. (NOTE)  Hardware firewall router had been previously configured and working on a WIn 2012 R2 with Exchange 2013 successfully.
6. After number 4, installed more critical updates.
7.  Installed Exchange 2016 Standard and restarted VM
8.  Logged into the https://dc-srv/ecp and applied settings on the Exchange 2016 server similar to those of Exchange 2013 (ie... Accepted Domain(s), established user accounts and chose to allow e-mail from Anyone (mail flow), established the default send connector and restarted the VM server to refresh the entire server again.
9. (NOTE)  DNS settings are similar to those of the Exchange 2013 server and therefore, not many changes were necessary but yet, were applied where applicable to the new Exchange 2016 server.

Tested e-mail to the Exchange 2016 server from a gmail, yahoo, and a live account and the new Exchange 2016 e-mail server isn't accepting incoming e-mail.
NOTE:  It is able to send out e-mail successfully but, isn't receiving replies.
Lastly, the e-mail messages are not bouncing back to gmail, yahoo and Live test e-mails.

Any ideas as to what may be preventing e-mail from being received?  A new configuration change different from that of Exchange 2013 necessary to have the Exchange 2016 server working?
eitconsultingAsked:
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John SmithCommented:
Are you able to test the inbound connection via telnet? You may need to install the Telnet client on windows via programs/features, but once you have that, try the following:

(Note Press Enter after you type each line)

telnet fqdnofyourexchangeserver.yourdomain.com 25
EHLO yourdomain.com
MAIL FROM:user@yourdomain.com
RCPT TO:user@yourdomain.com
data
Subject:Test
This is a test.
<enter><enter>full stop

Telnet does not let you use the Backspace key. If you make a mistake when you type a command, you must press Enter, and then start a new command.

Is this test message delivered? What error(s) do you get?

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David SankovskySenior SysAdminCommented:
John Smith
Expert Comment 2015-12-22 at 10:21:57ID: 41380884
Are you able to test the inbound connection via telnet? You may need to install the Telnet client on windows via programs/features, but once you have that, try the following:

(Note Press Enter after you type each line)

telnet fqdnofyourexchangeserver.yourdomain.com 25
EHLO yourdomain.com
MAIL FROM:user@yourdomain.com
RCPT TO:user@yourdomain.com
data
Subject:Test
This is a test.
<enter><enter>full stop

Telnet does not let you use the Backspace key. If you make a mistake when you type a command, you must press Enter, and then start a new command.

Is this test message delivered? What error(s) do you get?

I agree with John, I'd also check to see if your receive connectors were installed properly (check the settings, ports, etc.)

Also, please note that the telnet instructions sent by John assume a receive connector which is not SSL/TLS protected and does not require authentication, please match your settings accordingly before proceeding.
eitconsultingAuthor Commented:
Turns out my receive connector wasn't working properly.  I removed and recreated and tested successfully.
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