A client of mine owns the domain [url removed, login to view] and they have their own in-house MS Exchange 2003 Server. Their configuration is that a new POP email is received by GoDaddy, the Stein Exchange Server downloads the messages via the POPConnector, and delivers it to the user's Inbox. When a user sends an email from an Outlook client (Outlook 2003), it goes through the Exchange server and out through an SMTP Relay/Smarthost (NetAtlantic). Most emails are reaching their destination, so we know sending emails works, but some emails just never arrive to certain recipients at larger domains ([url removed, login to view], [url removed, login to view], etc). We noticed that since the Stein office is using a SMTP Relay, was necessary (with certain spam filters) for us to add a TXT record to the domain since email is sending from a different IP address than it is received from. So we did, but are still having the problems. I deleted one of the Outlook client profiles and recreated it on one of the workstations, and I thought the problem was resolved, but it is persisting - not all of their emails are reaching the destination. Here is the twist - if I log into an Exchange account via OWA on their server (ex. [url removed, login to view]), I can send emails from their account and they arrive at any destination immediately. If I send from Outlook, it may not arrive. This has to be an in-house problem, and someone familiar with Exchange should be able to figure it out. I can give you VNC access to the Server/Workstations and access to their GoDaddy account should you need to check the DNS settings. In addition to the sending problems, they are not receiving undeliverable messages from other servers when they send something out to the wrong address. They are, however getting undeliverable messages from the Exchange Server if they send an email to the wrong address in their domain (er248hf794 [at] steinsteinlaw [dot] com) - just not from any outside servers. Please help!
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Windows XP/Vista/7 Exchange 2003 Outlook 2003/2007