I'm troubleshooting an issue where we no longer receive the emails that come from the form on our website. This problem started this morning after installing a SonicWall TZ-210 router but I'm not convinced this issue is related to the SonicWall router.
I have hMailServer setup on our SBS 2008 box (with Exchange Server 2008). This instance of hMailServer acts only as an SMTP relay. It allows me to put our customer's email address in the From and ReplyTo fields (using ASP Classic) so that our users can reply directly to the email. There are no MX records that point to this instance of hMailServer since it is only used internally by our IT department for a few "no-reply" type tasks.
For example, you visit our website and fill out our contact form with your email address. The contact form sends the email to email@example.com (which is an exchange account) by authenticating with a valid account on our hMailServer.
I'm looking at hMail's logs and it processes the email without any problem so the original email sent from the website through hMailServer is making it past our router. Somewhere between hMailServer and Exchange Server the email appears to be getting lost.
We are using Microsoft Forefront Security for Exchange and I don't see anything in there that indicates that Forefront Security is getting rid of these emails. I have ForeFront Security configured so that it does not delete or reject any emails but rather flags anything questionable so that it goes in Outlook Junk mail. The "lost emails" I'm complaining about are not going into junk mail.