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I have an exchange 2003 server and some of my users have said that they are sporadically getting delivery delayed messages when sending to different domains. The majority of the time when they get the delayed delivery message they end up with a failed message. I personally have not had any of these messages and I use my email quite often to outside addresses. In order to cover my bases and make sure there are no issues on my end, what should I be checking?
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I have an exchange 2003 server and some of my users have said that they are sporadically getting delivery delayed messages when sending to different domains. The majority of the time when they get the delayed delivery message they end up with a failed message. I personally have not had any of these messages and I use my email quite often to outside addresses. In order to cover my bases and make sure there are no issues on my end, what should I be checking?

Exchange 2003 delayed delivery messages

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).