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How to set up SMTP so a remote server can send thru my Exchange

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  • How to set up SMTP so a remote server can send thru my Exchange

    I'm trying to figure this out, but I'm afraid it's a bit over my head.

    We've started using a specialized accounting service which consists of a remote server that hosts all of our accounting information. This software needs to integrate with my Exchange server hosted in my office (i.e. the accounting software will send emails to internal users, and it will send out customer invoices which will need to be routed through our Exchange server).

    Since I've never needed to use such a service with the Exchange server, I don't believe I have SMTP set up properly, and if I do, I don't know what my SMTP server address is. I've tried to telnet to smtp.domain.com, and I get an error saying that a connection to the host could not be opened.

    Can anyone help guide me in the right direction to get the SMTP server set up so that a remote server can send through my Exchange server simply by me providing the correct SMTP information?

    Thanks, I appreciate any help you can provide.

  • #2
    Re: How to set up SMTP so a remote server can send thru my Exchange

    To find out your mail server address use nslookup and set type=mx then lookup your domain name. It'll usually be mail.domain.com or something like that. You'll have to define the port as 25 to be able to telnet to it I.e. telnet mail.domain.com 25

    Opening up your Exchange server to any kind of external relaying is not something to be taken lightly, and if you are not familiar with Exchange I would consider getting a consultant in. I also don't like the sound of an application that requires mail relaying to operate correctly, seems a bit suspicious.
    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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    • #3
      Re: How to set up SMTP so a remote server can send thru my Exchange

      Originally posted by cruachan View Post
      Opening up your Exchange server to any kind of external relaying is not something to be taken lightly, and if you are not familiar with Exchange I would consider getting a consultant in. I also don't like the sound of an application that requires mail relaying to operate correctly, seems a bit suspicious.
      Sounds like a standard Accountancy application. Written for accountants by accountants. Usually do not follow any kind of standards in software writing, requiring local admin rights, using their own interfaces. Yes SAGE I am looking at you.

      Both requirements that have been listed do not require the use of your Exchange server. Sending email to your server just needs an SMTP server somewhere, and sending invoices to customers also just requires an SMTP server somewhere.

      If you are receiving email via SMTP then you will already be setup for it. MX records pointing to your server. If you are using the POP3 connector in SBS 2003 then you will not, and you will need to send email via another service.
      Hopefully the application doesn't require an open relay and can do authenticated relaying, because an open relay (even restricted by IP address) is just asking for trouble.

      Simon.
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      Simon Butler
      Exchange MVP

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