Exchange Server outgoing email disappearing

I have Windows SBS with the Exchange 2010 set up to send emails, but for some reason, none are being delivered and I am not sure how to debug this problem. I have Exchange 2010 set up with an outgoing SMTP transport that I have tried both Smart Host and DNS mechanisms. My ISP is Comcast and I have set up a Business Class account with username and password there, and this information is set up in the Smart Host, but there is no place to put it in the DNS transport. I have checked the mail queues and they are empty, and I do not get bounce back messages. The sent emails simply disappear. Before setting up the Comcast username and password, I was getting connection errors, so I believe that the emails are now at least passing on from my server. I am stuck!
RichAsked:
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imkotteesConnect With a Mentor Senior Messaging EngineerCommented:
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RichAuthor Commented:
Thanks for that info, but using these tools just proves that the emails are in fact being sent (I see DELIVER as the event code) but only emails to my GMail account are coming through. Others are simply going away, not showing up at the destination server. This is very strange to me.
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