Can I install a single Exchange 2010 server for a small company with all roles on the same server?

I need to install Exchange 2010 for a client and want to install it on a single server. I've previously done two migration upgrades from Exchange 2003 but this install has no prior Exchange servers. I tried installing 2010 and peformed the basic configuration steps, setup send and receive connectors and tested. I can send email to outside email accounts and between Exchange accounts internally but I cannot receive test emails from outside. I've got anonymous users checked in my receive connector configuration. I've tested using telnet from another system internally and successfully sent an email from an outside email account. I cannot telnet in to port 25 from outside my network. My firewall is configured to accept port 25 traffic inbound and I have a DNAT from the WAN IP address to the Exchange server's inside LAN IP for all port 25 traffic. This server has the CA,HT,MB roles installed. Do I require the Edge Transport role added and can I have this one server host all the roles?
jtforde518Asked:
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zippybungle2003Commented:
You do not need that role. Can you telnet from a local machine to the server, does the server have any AV software on blocking port 25.
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jtforde518Author Commented:
yes, I can telnet from another server and send mail from an outside email address to an exchange account and the mail is received. I do not currently have any AV software running and my server firewall is turned off.
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zippybungle2003Commented:
are the antispam agents installed in exchange on the server particualry content filtering, can you disable that and test again. You will find that on the hub  role
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jtforde518Author Commented:
Once I had confirmation that I didn't need the Edge role installed (edgetransport.exe is running and listening anyway) I did a wireshark capture and confirmed outbound port 25 traffic but no inbound port 25 traffic was ever reaching the server. I noticed that when I did a netstat -nbt that I didn't see anything listening on port 25 listed. However I did find an issue with one of my firewall rules (Vyatta) and once I corrected that I now have email flowing bidirectional. I'm accepting your solution as it helped prod my thinking and you responded so quickly to help. Thanks!!!
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